Question

Tính giá trị của biểu thức sau:\(-\left(\frac{2}{5}-\frac{3}{4}\right)-\left(\frac{3}{4}+\frac{3}{5}\right)\) 

Answer 1

\(-\left(\frac{2}{5}-\frac{3}{4}\right)-\left(\frac{3}{4}+\frac{3}{5}\right)=-\left(-\frac{7}{20}\right)-\left(\frac{27}{20}\right)=\frac{7}{20}-\frac{27}{20}=-\frac{20}{20}=-1\)

Answer 2

Ta có: \(-\left(\frac{2}{5}-\frac{3}{4}\right)-\left(\frac{3}{4}+\frac{3}{5}\right)=-\frac{2}{5}+\frac{3}{4}-\frac{3}{4}-\frac{3}{5}\)

\(=-\left(\frac{2}{5}+\frac{3}{5}\right)+\left(\frac{3}{4}-\frac{3}{4}\right)\)

\(=-1+0\)

\(=-1\)

Chuk bn hk tốt !