Question

Tính nhanh

A=[ 0,8 . 7 + ( 0,8 )\(^2\) ] . ( 1,25 . 7 - \(\dfrac{4}{5}\) . 1,25 ) + 31,64

AI GIÚP MK VỚI MK ĐANG CẦN RẤT LÀ GẤP

Answer 1

A=\(\left[0,8.\left(7+0,8\right)\right].\left[1,25.\left(7-\dfrac{4}{5}\right)\right]+31,64\)

=(0,8.7,8).(1,25.\(\dfrac{31}{5}\))+31,64

=48,36+31,64=80

Answer 2

A=[0,8.(7+0,8)].[1,25.(7-4/5)]+31,64

=(0,8.7,8).(1,25.31/5)+31,64

=48,36+31,64

=80