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Math Competition ProblemsProblem
1Problem 2Problem 3Problem 4Problem 5Problem 6Problem 7Problem 8Problem 9Problem
10Problem 11Problem 12Problem 13
EXITHOME
Muhammad Yusuf, S.Pd.SMP NEGERI 1 BOLO
BC EXAMTEXAS A&M HIGH SCHOOL MATH
CONTESTNOVEMBER 12, 2011
Editing by - Muhammad Yusuf
GO
Math Competition ProblemsProblem
1Problem 2Problem 3Problem 4Problem 5Problem 6Problem 7Problem 8Problem 9Problem
10Problem 11Problem 12Problem 13
EXITHOME
Muhammad Yusuf, S.Pd.SMP NEGERI 1 BOLO
Orang yang gagal selalu mencari jalan untuk
menghindari kesulitan, sementara orang yang
sukses selalu menerjang kesulitan untuk
menggapai kesuksesan.
Math Competition ProblemsProblem
1Problem 2Problem 3Problem 4Problem 5Problem 6Problem 7Problem 8Problem 9Problem
10Problem 11Problem 12Problem 13
EXITHOME
Muhammad Yusuf, S.Pd.SMP NEGERI 1 BOLO
Jika
Maka x = ...
Problem 1
Solusi
Math Competition ProblemsProblem
1Problem 2Problem 3Problem 4Problem 5Problem 6Problem 7Problem 8Problem 9Problem
10Problem 11Problem 12Problem 13
EXITHOME
Muhammad Yusuf, S.Pd.SMP NEGERI 1 BOLO
Berapakah jumlah semua pembagi dari 36, termasuk 1 dan dirinya sendiri
Problem 2
Solusi
Math Competition ProblemsProblem
1Problem 2Problem 3Problem 4Problem 5Problem 6Problem 7Problem 8Problem 9Problem
10Problem 11Problem 12Problem 13
EXITHOME
Muhammad Yusuf, S.Pd.SMP NEGERI 1 BOLO
Keliling sebuah persegi panjang adalah 28 m. Sebuah persegi panjang yang lain dengan panjang 3 kali panjang persegi panjang pertama dan lebar 2 kali lebar persegi panjang pertama memiliki luas 72 m. Berapakah luas persegi panjang pertama?
Problem 3
Solusi
Math Competition ProblemsProblem
1Problem 2Problem 3Problem 4Problem 5Problem 6Problem 7Problem 8Problem 9Problem
10Problem 11Problem 12Problem 13
EXITHOME
Muhammad Yusuf, S.Pd.SMP NEGERI 1 BOLO
Sebuah operasi “ * “ didefinisikan dengan :
a * b = a2 + 3b
Tentukan nilai dari (2 * 0) * (0 * 1)
Problem 4
Solusi
Math Competition ProblemsProblem
1Problem 2Problem 3Problem 4Problem 5Problem 6Problem 7Problem 8Problem 9Problem
10Problem 11Problem 12Problem 13
EXITHOME
Muhammad Yusuf, S.Pd.SMP NEGERI 1 BOLO
Segitiga ABC dengan panjang AB = 25 meter, AC = 24 meter, dan BC = 23 meter. Suatu titik D yang merupakan titik pada AC sehingga BD tegak lurus dengan AC. Berapakah AD − DC?
Problem 5
Solusi
Math Competition ProblemsProblem
1Problem 2Problem 3Problem 4Problem 5Problem 6Problem 7Problem 8Problem 9Problem
10Problem 11Problem 12Problem 13
EXITHOME
Muhammad Yusuf, S.Pd.SMP NEGERI 1 BOLO
Jika
Maka x = ...
Problem 6
Solusi
Math Competition ProblemsProblem
1Problem 2Problem 3Problem 4Problem 5Problem 6Problem 7Problem 8Problem 9Problem
10Problem 11Problem 12Problem 13
EXITHOME
Muhammad Yusuf, S.Pd.SMP NEGERI 1 BOLO
Tentukan penyelesaian dari :
Untuk 0 ≤ x ≤ 2
Problem 7
Solusi
Math Competition ProblemsProblem
1Problem 2Problem 3Problem 4Problem 5Problem 6Problem 7Problem 8Problem 9Problem
10Problem 11Problem 12Problem 13
EXITHOME
Muhammad Yusuf, S.Pd.SMP NEGERI 1 BOLO
What is the last digit of the sum
1! + 2! + 3! + · · · + 2010! + 2011! ?
Problem 8
Solusi
Math Competition ProblemsProblem
1Problem 2Problem 3Problem 4Problem 5Problem 6Problem 7Problem 8Problem 9Problem
10Problem 11Problem 12Problem 13
EXITHOME
Muhammad Yusuf, S.Pd.SMP NEGERI 1 BOLO
Suppose that f(x) is a function
such that for every real number
x :
i) f(x) + f(1 − x) = 11
ii) f(1 + x) = 3 + f(x)
Then f(x) + f(−x) =
Problem 9
Solusi
Math Competition ProblemsProblem
1Problem 2Problem 3Problem 4Problem 5Problem 6Problem 7Problem 8Problem 9Problem
10Problem 11Problem 12Problem 13
EXITHOME
Muhammad Yusuf, S.Pd.SMP NEGERI 1 BOLO
Let a, b and c be the three roots
of x3 − 64x− 14 . What is
the value of a3 + b3 + c3 ?
Problem 10
Solusi
Math Competition ProblemsProblem
1Problem 2Problem 3Problem 4Problem 5Problem 6Problem 7Problem 8Problem 9Problem
10Problem 11Problem 12Problem 13
EXITHOME
Muhammad Yusuf, S.Pd.SMP NEGERI 1 BOLO
Let ABC be an isosceles right triangle with right angle at C. Let P be a point inside the triangle such that AP = 3, BP = 5, and CP = 2√2. What is the area of the triangle ABC?
Problem 11
Solusi
Math Competition ProblemsProblem
1Problem 2Problem 3Problem 4Problem 5Problem 6Problem 7Problem 8Problem 9Problem
10Problem 11Problem 12Problem 13
EXITHOME
Muhammad Yusuf, S.Pd.SMP NEGERI 1 BOLO
In how many distinct ways can
one write 1,000,000 as the
product of three positive
integers? Treat all orderings of
the same set of factors as one
way
Problem 12
Solusi
Math Competition ProblemsProblem
1Problem 2Problem 3Problem 4Problem 5Problem 6Problem 7Problem 8Problem 9Problem
10Problem 11Problem 12Problem 13
EXITHOME
Muhammad Yusuf, S.Pd.SMP NEGERI 1 BOLO
A cube is inscribed in a ball.
What is the ratio of the volume
of the cube to the volume of the
ball?
Problem 13
Solusi
Math Competition ProblemsProblem
1Problem 2Problem 3Problem 4Problem 5Problem 6Problem 7Problem 8Problem 9Problem
10Problem 11Problem 12Problem 13
EXITHOME
Muhammad Yusuf, S.Pd.SMP NEGERI 1 BOLO
Math Competition ProblemsProblem
1Problem 2Problem 3Problem 4Problem 5Problem 6Problem 7Problem 8Problem 9Problem
10Problem 11Problem 12Problem 13
EXITHOME
Muhammad Yusuf, S.Pd.SMP NEGERI 1 BOLO
Pembagi dari 36 : 1, 2, 3, 4, 6, 9, 12, 18, 36
Jumlahnya : 1 + 2 + 3 + 4 + 6 + 9 + 12 +
18 + 36= 91
Math Competition ProblemsProblem
1Problem 2Problem 3Problem 4Problem 5Problem 6Problem 7Problem 8Problem 9Problem
10Problem 11Problem 12Problem 13
EXITHOME
Muhammad Yusuf, S.Pd.SMP NEGERI 1 BOLO
Persegi panjang A, dengan panjang = p dan lebar = l
Kelilingnya = 28, sehingga 2p + 2l = 28Persegi panjang B, dengan panjang = 3p
dan lebar = 2l
Kelilingnya = 72, sehingga 2(3p + 2l) = 72Disederhanakan menjadi 3p + 2l = 36
Persamaan 1
Persamaan 2
2p + 2l = 283p + 2l = 36
p = 8 m dan l = 6 m
Sehingga luas segitiga pertama = 8 × 6 = 48 m2
Math Competition ProblemsProblem
1Problem 2Problem 3Problem 4Problem 5Problem 6Problem 7Problem 8Problem 9Problem
10Problem 11Problem 12Problem 13
EXITHOME
Muhammad Yusuf, S.Pd.SMP NEGERI 1 BOLO
a * b = a2 + 3b
(2 * 0) = 22 + 30 = 4 + 1 = 5 (0 * 1) = 02 + 31 = 0 + 3 = 3(2 * 0) * (0 * 1) = (5 * 3) = 52 + 33 = 25 + 27 = 52
Math Competition ProblemsProblem
1Problem 2Problem 3Problem 4Problem 5Problem 6Problem 7Problem 8Problem 9Problem
10Problem 11Problem 12Problem 13
EXITHOME
Muhammad Yusuf, S.Pd.SMP NEGERI 1 BOLO
BD2 = BC2 – CD2
BD2 = 242 – CD2
Disamping itu,BD2 = AB2 – AD2
BD2 = 252 – AD2
BD2 = 625 – AD2
Sehingga 576 – CD2 = 625 – AD2
AD2 – CD2 = 49(AD – CD)(AD + CD) = 49(AD – CD) × 23 = 49
A B
C
25 meter
24 meter23 meter
D
Sehingga AD – CD =
4923
Math Competition ProblemsProblem
1Problem 2Problem 3Problem 4Problem 5Problem 6Problem 7Problem 8Problem 9Problem
10Problem 11Problem 12Problem 13
EXITHOME
Muhammad Yusuf, S.Pd.SMP NEGERI 1 BOLO
Pangkat disamakan,
Math Competition ProblemsProblem
1Problem 2Problem 3Problem 4Problem 5Problem 6Problem 7Problem 8Problem 9Problem
10Problem 11Problem 12Problem 13
EXITHOME
Muhammad Yusuf, S.Pd.SMP NEGERI 1 BOLO
Kedua ruas dikuadratkan,
Penyelesaian persamaan tersebut
Math Competition ProblemsProblem
1Problem 2Problem 3Problem 4Problem 5Problem 6Problem 7Problem 8Problem 9Problem
10Problem 11Problem 12Problem 13
EXITHOME
Muhammad Yusuf, S.Pd.SMP NEGERI 1 BOLO
Sehingga nilai x adalah
Math Competition ProblemsProblem
1Problem 2Problem 3Problem 4Problem 5Problem 6Problem 7Problem 8Problem 9Problem
10Problem 11Problem 12Problem 13
EXITHOME
Muhammad Yusuf, S.Pd.SMP NEGERI 1 BOLO
Mulai dari 5! Dan seterusnya, angka satuanya adalah nol.
Sehingga yang perlu diperhatikan adalah jumlah dari1! + 2! + 3! + 4! = 1 + 2 + 6 + 24 = 33
Sehingga angka satuannya adalah 3
Math Competition ProblemsProblem
1Problem 2Problem 3Problem 4Problem 5Problem 6Problem 7Problem 8Problem 9Problem
10Problem 11Problem 12Problem 13
EXITHOME
Muhammad Yusuf, S.Pd.SMP NEGERI 1 BOLO
f(x) + f(1 − x) = 11 f(-x) + f(1 + x) = 11
f(1 + x) = 3 + f(x) f(1 - x) = 3 + f(-x)
Sehingga : f(x) + f(1 − x) = 11 f(x) + 3 + f(-x) = 11
f(x) + f(-x) = 8
f(-x) + f(1 + x) = 11 f(-x) + 3 + f(x) = 11f(-x) + f(x) = 8
atau
Math Competition ProblemsProblem
1Problem 2Problem 3Problem 4Problem 5Problem 6Problem 7Problem 8Problem 9Problem
10Problem 11Problem 12Problem 13
EXITHOME
Muhammad Yusuf, S.Pd.SMP NEGERI 1 BOLO
x3 − 64x− 14 = (x − a)(x − b)(x − c)
= x3 − (a + b + c)x2 + (ab + bc + ac)x − abc
Dengan (a + b + c) = 0, maka
a3 + b3 + c3 = (64a + 14) + (64b + 14) + (64c + 14)= 64(a + b + c) + 42= 64(0) + 42= 42
Math Competition ProblemsProblem
1Problem 2Problem 3Problem 4Problem 5Problem 6Problem 7Problem 8Problem 9Problem
10Problem 11Problem 12Problem 13
EXITHOME
Muhammad Yusuf, S.Pd.SMP NEGERI 1 BOLO
C B
A
P
Misalkan AC = CB = l
D
PD2 = 9 – (l – DC)2
PD2 = 8 – CD2
9 – (l – DC)2 = 8 – DC2
l2 - 2DC = 1E
PE2 = 25 – (l – CE)2
PE2 = 8 – CE2
25 – (l – CE)2 = 8 – CE2
l2 - 2CE = 17
Karena DC = CE , maka2l2 - 4DC = 18
l2 - 2DC = 1
Math Competition ProblemsProblem
1Problem 2Problem 3Problem 4Problem 5Problem 6Problem 7Problem 8Problem 9Problem
10Problem 11Problem 12Problem 13
EXITHOME
Muhammad Yusuf, S.Pd.SMP NEGERI 1 BOLO
C B
A
PD
l2 - 2DC = 1
E
l2 - 2CE = 17
Karena DC2 + CE2 = 8l , maka
danDC = ½ (l2 – 1) CE = ½ (l2 – 17)
¼(l2 – 1)2 + ¼(l2 – 17)2 = 8l(l2 – 1)2 + (l2 – 17)2 = 32l2
l4 – 2l2 + 1+ l4 – 34l2 + 289 = 32l2
l4 – 34l2 + 145 = 0 l2 = 5 atau 29Yang memenuhi hanya l2 = 29
Sehingga luasnya = 29/2
Math Competition ProblemsProblem
1Problem 2Problem 3Problem 4Problem 5Problem 6Problem 7Problem 8Problem 9Problem
10Problem 11Problem 12Problem 13
EXITHOME
Muhammad Yusuf, S.Pd.SMP NEGERI 1 BOLO
Let (x, y) be the coordinates of P . Then x2 + y2 = 8 , (s − x)2 + y2 = 9 and (s − y)2 + x2 = 25 . We obtain s2 − 2sx = 1 and s2 − 2sy = 17 . Solve for x and y in terms of s , and place in the first equation, obtaining (s2 − 1)2 + (s2 − 17)2 = 32s2 . This simplifes to s4 − 34s2 + 145 = 0 , hence s2 = 5 or 29 . Only s2 = 29 is consistent with the given data (notice that if s = √5 , then √10 = √2s = AB > BP = 5, a contradiction). Thus, the area is 29/2