Question

Tìm x (x:2-39).7+3=80

Answer 1

(x:2-39).7=77<=>x:2-39=11<=>x:2=50<=>x=100

Answer 2

\(\left(x:2-39\right)\cdot7+3=80\)

\(\left(x:2-39\right)\cdot7=80-3\)

\(\left(x:2-39\right)\cdot7=77\)

\(x:2-39=77:7\)

\(x:2-39=11\)

\(x:2=11+39\)

\(x:2=50\)

\(x=50\cdot2\)

\(x=100\)