Question

[Akari Yukino]

Tính :

a) \(\frac{2\times3\times5}{70}\)      b) \(\frac{2\times6\times11}{33\times24}\)      c) \(\frac{21\times45}{9\times7\times5\times3}\)

Answer 1

[Nguyễn Văn Quyến]

a) \(\frac{2\cdot3\cdot5}{70}=\frac{30}{70}=\frac{3}{7}\)

b) \(\frac{2\cdot6\cdot11}{33\cdot24}=\frac{2\cdot6\cdot11}{3\cdot11\cdot2\cdot2\cdot6}=\frac{1}{6}\)

c) \(\frac{21\cdot45}{9\cdot7\cdot5\cdot3}=\frac{3\cdot7\cdot5\cdot9}{9\cdot7\cdot5\cdot3}=1\)

                          Chúc bạn học tốt.

Answer 2

[Khánh Duy]

a)\(\frac{2x3x5}{70}=\frac{1x3x5}{35}=\frac{1x3x1}{7}=\frac{3}{7}\)

b)\(\frac{2x6x11}{33x24}=\frac{2x6x1}{3x24}=\frac{2x1x1}{3x4}=\frac{1x1x1}{3x2}=\frac{1}{6}\)

c)\(\frac{21x45}{9x7x5x3}=\frac{3x5}{1x1x5x3}=\frac{1x1}{1x1x1x1}=1\)