Question

Rút gọn phân số :a, \(\frac{3.13-13.8}{15.40-80}\)

B,\(\frac{18.34+\left(-18\right).124}{\left(-36\right).17+9_{ }\left(-52\right)}\)

Answer 1

\(\frac{13.\left(3-8\right)}{40.\left(15-2\right)}=\frac{13.\left(-5\right)}{40.13}=\frac{-1}{8}\)

\(\frac{18.34+\left(-18\right).124}{\left(-36\right).17+9.\left(-52\right)}=\frac{18.34+18.\left(-124\right)}{\left(-36\right).17+9.\left(-4\right).13}=\frac{18.\left[34+\left(-124\right)\right]}{\left(-36\right).\left(17+13\right)}=\frac{18.\left(-90\right)}{\left(-36\right).30}=\frac{3}{2}\)

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