Question

1/12*8/9*8/4、(1/14+2/7)*7/8、19*(1/2-7/19)、4/5-1/3*3/4、26+1/5

Answer 1

1/12*8/9*8/4

=2/27*2

=4/27

(1/14+2/7)*7/8

=1/14*7/8+2/7*7/8

=1/16+1/4

=5/16

19*(1/2-7/19)

=19*1/2-19*7/19

=9.5-7

=2.5

4/5-1/3*3/4

=4/5-1/4

=11/20

26+1/5*1/3

=26+1/15

=26又1/15

(4/5-2/3)*15/2

=4/5*15/2-2/3*15/2

=6-5

=1