Question

rút gọn

a)\(\frac{7.25-49}{7.24+21}\)                                                     b)\(\frac{2.\left(-13\right).9.10}{\left(-3\right).4.-5.\left(-5\right).26}\)

 

Answer 1

a\(\frac{7.25-49}{7.24+21}\)=\(\frac{1.25-49}{1.24+21}\)=\(\frac{25-49}{24+21}\)=\(\frac{-8}{15}\)

mình làm câu a thôi nhé

Answer 2

\(a~\frac{7.25-49}{7.24+21}\)

\(=\frac{7.25-7.7}{7.24+7.3}\)

\(=\frac{7\left(25-7\right)}{7\left(24+3\right)}\)

\(=\frac{18}{27}=\frac{2}{3}\)

\(b~\frac{2.\left(-13\right).9.10}{\left(-3\right).4.\left(-5\right).26}\)

\(=\frac{2.\left(-13\right).3.3.2.5}{\left(-3\right).2.2.\left(-5\right).2.13}\)

\(=\frac{\left(-1\right).3}{\left(-1\right).\left(-1\right).2}\)

\(=\frac{3}{\left(-1\right).2}\)

\(=\frac{3}{-2}\)

\(=-\frac{3}{2}\)