解方程25%x+25=100【1-20%】X=56X+75%X=280X=是未知数
①解:0.25x+25-25=100-25
0.25x=75
0.25x÷0.25=75÷0.25
x=300
②解:0.8x=56
0.8x÷0.8=56÷0.8
x=70
③解:1.75x=280
1.75x÷1.75=280÷1.75
x=160
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①解:0.25x+25-25=100-25
0.25x=75
0.25x÷0.25=75÷0.25
x=300
②解:0.8x=56
0.8x÷0.8=56÷0.8
x=70
③解:1.75x=280
1.75x÷1.75=280÷1.75
x=160