Question

- Rút gọn phân số:

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

b/ 15.8+15.4 / 12.3

Answer 1

a, ta có \(\frac{2.\left(-13\right).9.10}{\left(-3\right).4.\left(-5\right).26}\)=\(\frac{2.\left(-13\right).\left(-3\right).\left(-3\right).2.\left(-5\right)}{\left(-3\right).2.2.\left(-5\right).\left(-2\right).\left(-13\right)}\)

rút gọn đi còn: \(\frac{-3}{-2}\)=\(\frac{3}{2}\)

Answer 2

15×8+15×4/12×3

= 15×(8+4)/12×3

=15×12/12×3

=15/3

=5