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