Question

tính bằng cách thuận tiện

   2*3*5/70

   2*6*11/33*4​​

   21*45/9*7*5*3

làm có cách giải hộ tớ nha

Answer 1

a)70=2*5*7

=>2*3*5/70=3/7

b)33*4=11*3*2*2=11*6*2

=>2*6*11/33*4=1

c)21*45=9*5*3*7

=>21*45/3*5*7*9=1

Answer 2

\(\frac{2\times3\times5}{70}\)

= \(\frac{2\times3\times5}{7\times2\times5}\)

= \(\frac{3}{7}\)

Answer 3

\(\frac{2\cdot6\cdot11}{33\cdot4}\)= \(\frac{2\cdot3\cdot2\cdot11}{33\cdot4}=\frac{33}{132}=\frac{11}{44}\)

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