x+1/2=3/4
x=3/4-1/2
x=3/4-2/4
x=1/4
65 -8x=25
8x=65-25
x=40÷8
x=5
7/2x=35
x=35X2/7
x=5X2
x=10
3/5x÷1/3=12
x=12X1/3÷3/5
x=4X5/3
x=20/3
x=6又3分之2
x-1/2=3/4
x=3/4+1/2
x=5/4
65-8x=25
8x=65-25
8x=40
x=5
3/5x÷1/3=12
9/5x=12
x=12÷9/5
x=20/3
如图所示
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