Question

 

Giúp Mình câu B

Answer 1

a: \(-\frac38+\frac{12}{25}+\frac{5}{-8}+\frac{2}{-5}+\frac{13}{25}+1\)

\(=\left(-\frac38-\frac58\right)+\left(\frac{12}{25}+\frac{13}{25}\right)+1-\frac25\)

\(=-1+1+1-\frac25=1-\frac25=\frac35\)

b: \(\left(-\frac25+\frac37\right)-\left(\frac49+\frac{12}{20}-\frac{13}{35}\right)+\frac{7}{35}\)

\(=-\frac25+\frac37-\frac49-\frac35+\frac{13}{35}+\frac{7}{35}\)

\(=\left(-\frac25-\frac35\right)+\left(\frac37+\frac{20}{35}\right)-\frac49=-1+1-\frac49=-\frac49\)