120x(1/8+1/3+1/6)= 1/2x5/12+1/2x1/3= 1/18x46+4/9x46= (4/7x5/
2个回答

120x(1/8+1/3+1/6)

=120×(1/8)+120×(1/3)+120×(1/6)

=15+40+20

=75

1/2x5/12+1/2x1/3

=(1/2)×(5/12 +1/3)

=(1/2)×(9/12)

=(1/2)×(3/4)

=3/8

1/18x46+4/9x46

=(1/18 +4/9)×46

=(9/18)×46

=(1/2)×46

=23

(4/7x5/4+1)÷0.2

=(5/7 +1)÷(1/5)

=(12/7)×5

=60/7

(=8又7分之4)

(5/9-1/2x1/3)÷5/6

=(5/9-1/2x1/3)×(6/5)

=(5/9)×(6/5) -(1/6)×(6/5)

=2/3 -1/5

=10/15 -3/15

=7/15