Question

A= 2³.5.7.5².7³/ (2. 5.7²)²

Answer 1

Ta có: \(A=\dfrac{2^3\cdot5\cdot7\cdot5^2\cdot7^3}{\left(2\cdot5\cdot7^2\right)^2}\)

\(=\dfrac{2^3\cdot5^3\cdot7^4}{2^2\cdot5^2\cdot7^4}=\dfrac{10\cdot2^2\cdot5^2}{2^2\cdot5^2}\)

=10

Answer 2

\(A=\dfrac{(2^3.5.7).(5^2.7^3)}{(2.5.7^2)^2}\)

\(=\dfrac{2^3.5^3.7^4}{2^2.5^2.7^4}\)

\(=2.5\)

\(=10\)

Answer 3

A=2^3.5.7.5^2.7^3/(2.5.7^2)^2

A=2^3.(5.5^2).(7.7^3)/2^2.5^2.7^4

A=2^3.5^3.7^4/2^2.5^2.7^4

A=(2^3/2^2).(5^3/5^2).(7^4/7^4)

A=2.5.1

A=10

Vậy A=10