Question

[Đỗ Thị Huyền]

^{Rút gọn} 

^{a) \(\frac{7\cdot25-49}{7\cdot24+21}\)}

^{b)\(\frac{2\cdot\left(-13\right)\cdot9\cdot10}{\left(-3\right)\cdot4\cdot\left(-5\right)\cdot26}\)}

Answer 1

[Phạm Ngọc Sơn]

a)  \(\frac{7.25-49}{7.24+21}=\frac{-2}{1}=-2\)

b) \(\frac{2.\left(-13\right).9.10}{\left(-3\right).4.\left(-5\right).26}=\frac{1.1.\left(-3\right).\left(-2\right)}{1.2.1.2}=\frac{6}{4}=\frac{2}{3}\)