Question

Thực hiện phép tính

A) -12 : ( 3/4 - 5/6)²

b) 7/23. [ ( - 8/6) - 45/18]

Answer 1

a) \(-12:\left(\frac{3}{4}-\frac{5}{6}\right)^2=-\frac{12}{\left(\frac{3}{4}-\frac{5}{6}\right)^2}=-\frac{12}{\frac{1}{12^2}}\)

\(=-\frac{12^2.12}{1}=12^2.12\)

\(=-12^3=--1728\)

b) \(\frac{7}{23}.\left[\left(-\frac{8}{6}\right)-\frac{45}{18}\right]=\frac{7}{23}.\left(-\frac{4}{3}-\frac{5}{2}\right)\)

\(=\frac{7}{23}.\left(-\frac{23}{6}\right)=-\frac{7}{23}.\frac{23}{6}\)

\(=-\frac{7}{6}\)