Các câu hỏi tương tự
FIND all the natural numbers a and b such that
the product of "largest common divisor" of (a,b) and "lowest common multiple" of (a,b) is 510510.
tricky problem
A string is wound symmetrically around a circular rod. The string goes exactly 4 times around the rod. The circumference of the rod is 4 cm. and its length is 12 cm. Find the length of the string? Show all your work.Tạm dịch là:“Một sợi dây được quấn đối xứng 4 vòng quanh một ống trụ tròn đều. Ống trụ có chu vi 4 cm và độ dài là 12 cm.Hỏi: Sợi dây dài bao nhiêu cm? Giải thích cách làm”.
Đọc tiếp
"A string is wound symmetrically around a circular rod. The string goes exactly 4 times around the rod. The circumference of the rod is 4 cm. and its length is 12 cm. Find the length of the string? Show all your work."
Tạm dịch là:
“Một sợi dây được quấn đối xứng 4 vòng quanh một ống trụ tròn đều. Ống trụ có chu vi 4 cm và độ dài là 12 cm.
Hỏi: Sợi dây dài bao nhiêu cm? Giải thích cách làm”.
Of the numbers 1,2,…,1000, how many numbers are divisible by neither 6 nor 9?
Answer:
How many 4-digit whole numbers, whose sum of all its digits is 35, are even?
Answer: number(s).(dịch+cách làm)
The average of six numbers is 4. If a seventh number is added, the average of seven numbers will be 5. Then the seventh number is .
A set of numbers (a1,a2,a3,.....,a 2015) has 2015 different numbers. The average of this set is 25. The average of the set (a1,a2,a3,.....,a 2015,25) is.........
Giúp mik với nhé
Câu 1 The function mm is defined on the real numbers by m(k) dfrac{k+2}{k+8}m(k) k+8 k+2 . What is the value of 10times m(2)10×m(2)? Answer: Câu 2 The function ff is defined on the real numbers by f(x) ax-3f(x)ax−3. What is the value of a if f(3)9f(3)9? Answer: Câu 3 The function ff is defined on the real numbers by f(x) 2x+a-3f(x)2x+a−3. What is the value of a if f(-5)11f(−5)11? Answer: Câu 4 The function ff is defined on the real numbers by f(x) 2 + x-x^2f(x)2+x−x 2 . What is the value of...
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Câu 1 The function mm is defined on the real numbers by m(k) = \dfrac{k+2}{k+8}m(k)= k+8 k+2 . What is the value of 10\times m(2)10×m(2)? Answer: Câu 2 The function ff is defined on the real numbers by f(x)= ax-3f(x)=ax−3. What is the value of a if f(3)=9f(3)=9? Answer: Câu 3 The function ff is defined on the real numbers by f(x)= 2x+a-3f(x)=2x+a−3. What is the value of a if f(-5)=11f(−5)=11? Answer: Câu 4 The function ff is defined on the real numbers by f(x) = 2 + x-x^2f(x)=2+x−x 2 . What is the value of f(-3)f(−3)? Answer: Câu 5 Given a real number aa and a function ff is defined on the real numbers by f(x)=-6\times|3x|-4f(x)=−6×∣3x∣−4. Compare: f(a)f(a) f(-a)f(−a) Câu 6 There are ordered pairs (x;y)(x;y) where xx and yy are integers such that \dfrac{5}{x}+\dfrac{y}{4}=\dfrac{1}{8} x 5 + 4 y = 8 1 Câu 7 Given a negative number kk and a function ff is defined on the real numbers by f(x)=\dfrac{6}{13}xf(x)= 13 6 x. Compare: f(k)f(k) f(-k)f(−k) Câu 8 Given a positive number kk and a function ff is defined on the real numbers by f(x)=\dfrac{-3}{4}x+4f(x)= 4 −3 x+4. Compare: f(k)f(k) f(-k)f(−k). Câu 9 A=(1+2+3+\ldots+90) \times(12 \times34-6 \times 68):(\dfrac{1}{3}+\dfrac{1}{4}+\dfrac{1}{5}+\dfrac{1}{6})=A=(1+2+3+…+90)×(12×34−6×68):( 3 1 + 4 1 + 5 1 + 6 1 )= Câu 10 Given that \dfrac{2x+y+z+t}{x}=\dfrac{x+2y+z+t}{y}=\dfrac{x+y+2z+t}{z}=\dfrac{x+y+z+2t}{t} x 2x+y+z+t = y x+2y+z+t = z x+y+2z+t = t x+y+z+2t . The negative value of \dfrac{x+y}{z+t}+\dfrac{y+z}{t+x}+\dfrac{z+t}{x+y}+\dfrac{t+x}{y+z} z+t x+y + t+x y+z + x+y z+t + y+z t+x is
The function f is defined on the real numbers by f(x)= ax-3f(x)=ax−3. What is the value of a if f(5)=12f(5)=12? Answer:
The length of three sides of a triangle is proportional to 2; 3; 4.Three heights corresponding to those 3 sides are proportional to which 3 numbers?