Question

Rút gọn: 

 a) 7.25-49/ 7.24+21

b) 2. (-13).9.10 / (-3).4.(-5).26

Answer 1

a, \(\frac{7.25-49}{7.24+21}=\frac{7.25-7.7}{7.24+7.3}=\frac{7.\left(25-7\right)}{7.\left(24+3\right)}=\frac{7.18}{7.27}=\frac{7.9.2}{7.9.3}=\frac{2}{3}\)

b, \(\frac{2.\left(-13\right).9.10}{-3.4.\left(-5\right).26}=\frac{2.13.\left(-3\right).3.\left(-2\right).\left(-5\right)}{-3.\left(-2\right).\left(-2\right).\left(-5\right).2.13}=\frac{-3}{2}\)

Answer 2

a)\(\frac{2}{3}\)

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

Answer 3

a)\(\frac{2}{3}\)

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

Answer 4

\(a,\frac{2}{3}\)

\(b,-\frac{2}{3}\)

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