Question

Thực hiện phép tính sau:
\(-\dfrac{7}{9}\times\sqrt{-0,81^2}\)
b) √(49) . √(144) + √(256) : √(64)
c) 72 : √(2² .3² .36) - √(225)

Answer 1

`a, = -7/9 xx 9/10 = -0,7`

`b, = 732 : 36 - 15`

`= 21 - 15 = 16`

Answer 2

\(-\dfrac{7}{9}\cdot\sqrt{\left(-0,81\right)^2}=-\dfrac{7}{9}\cdot0,81=0,63\)

\(72:\sqrt{\left(2^2\cdot3^2\cdot36\right)}-\sqrt{225}=72:\sqrt{1296}-15=2-15=-13\)