Question

NHÂN CÁC PHÂN SỐ SAU(CHÚ Ý RÚT GỌN NẾU CÓ THỂ):

a) \(\frac{-1}{4}\).\(\frac{1}{3}\)

b) \(\frac{-2}{5}\).\(\frac{5}{-9}\)

c) \(\frac{-9}{11}\).\(\frac{5}{18}\)

Answer 1

a -1/12

b 2/9

c -5/22

Answer 2

a) \(\frac{-1}{4}.\frac{1}{3}=\frac{\left(-1\right).1}{4.3}\frac{-1}{12}\)

b) \(\frac{-2}{5}.\frac{5}{-9}=\frac{\left(-2\right).5}{5.\left(-9\right)}=\frac{-10}{-45}=\frac{-2}{-9}=\frac{2}{9}\)

c) \(\frac{-9}{11}.\frac{5}{18}=\frac{\left(-9\right).5}{11.18}=\frac{-45}{198}=\frac{-5}{22}\)

Kp nha!!!!

Answer 3

-1/4.1/3 =-1/12

-2/5.5/-9 =-2/5.-5/9 = 2/9

-9/11 . 5/18 = -5 / 22