Question

简算.（1）3／7除5／8除16／21.（2）8／17除23十1／23X9／17.（3）23一8／9X3／4除1／27.

Answer 1

1、3/7x8/5x21/16

=9/2

2、8/17*1/23+9/17*1/23

=1/23*(8/17+9/17)

=1/23

3、23-8/9*3/4*27

=23-8/9*27*3/4

=23-7

=16

4、（2/3+4/15*5/6）*21/20

=(2/3+2/9)*21/20

=2/3*21/20+2/9*21/20

=7/10+7/30

=14/15