Question

计算 能简便的用简便方法 2-7/9+2*7/9 6又4/5*9/20*1又8/17 4又2/11*5又3/4-4又2/

Answer 1

2-7/9+2*7/9

=2+2*7/9-7/9

=2+7/9*(2-1)

=2+7/9

=2又7/9

6又4/5*9/20*1又8/17

=34/5*9/20*25/17

=(34*9*25)/(5*20*17)

=(17*2*9*25)/(5*5*4*17)

=(2*9)/4

=9/2

4又2/11*5又3/4-4又2/11*4.75

=4又2/11*5又3/4-4又2/11*4又3/4

=4又2/11*(5又3/4-4又3/4)

=4又2/11*1

=4又2/11*