4(x-0.5)=4/5 1/4（x-0.75)=13/16 20％x=3/5-x

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4*(x-0.5)=4/51/4*（x-0.75)=13/1620％x=3/5-x4*(x-0.5)=4/51/4*（x-0.75)=13/1620％x=3/5-x4*(x-0.5)=4/51/4*（

4*(x-0.5)=4/5 1/4*（x-0.75)=13/16 20％x=3/5-x
4*(x-0.5)=4/5 1/4*（x-0.75)=13/16 20％x=3/5-x

4*(x-0.5)=4/5 1/4*（x-0.75)=13/16 20％x=3/5-x
4*(x-0.5)=4/5
x-0.5=4/5÷4
x-0.5=0.2
x=0.7
1/4*（x-0.75)=13/16
x-0.75=13/16÷1/4
x-0.75=13/4
x=13/4+3/4
x=4
20％x=3/5-x
(1+20%)x=3/5
1.2x=0.6
x=1/2

4*(x-0.5)=4/5
4x-2=4/5
4x=4/5+2
4x=14/5
x=14/5*1/4
x=7/10
1/4*（x-0.75)=13/16
1/4x-3/16=13/16
1/4x=13/16+3/16
1/4x=1
x=1*4
x=4
20％x=3/5-x
0.2x+x=3/5
1.2x=0.6
x=5

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