Question

91. {195: [84-(21+16x) ]} =7 

Nhanh Nha mình sắp đi học rồi

 

Answer 1

\(91.\left\{195:\left[84-\left(21+16x\right)\right]\right\}=7\)

\(195:\left[84-\left(21+16x\right)\right]=\frac{7}{91}\)

\(195:\left[84-\left(21+16x\right)\right]=\frac{1}{13}\)

\(84-\left(21+16x\right)=195:\frac{1}{13}\)

\(84-\left(24+16x\right)=195.13\)

\(84-\left(24+16x\right)=2535\)

\(24+16x=84-2535\)

\(24+16x=-2451\)

\(16x=-2451-24\)

\(16x=-2475\)

\(x=\frac{-2475}{16}\)

vay \(x=\frac{-2475}{16}\)