您好:
3/5×1/8+2/5÷8
=3/5x1/8+2/5x1/8
=(3/5+2/5)x1/8
=1x1/8
=1/8
[1-(1/3+1/2)]÷2/3
=(1-5/6)÷2/3
=1/6÷2/3
=1/4
(2-3/4)x=4/5
5/4x=4/5
x=4/5÷5/4
x=16/25
3/4x+3/2x=9/16
9/4x=9/16
x=9/16÷6/4
x=1/4
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