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3x一25℅x=30解方程

x/4=30% x=4*0.3 x=1.2

X-0.3X=7, 0.7X=7, X=7÷0.7, X=10。

x一5℅x=19o 95%x=190 x=190*100/95=200 x=200

45℅x/16十x=25℅ 45℅x/16十16x/16=25℅ (45%+16)x/16=25% (45%+16)x=16×25%=4 x=4/(45%+16) =4/(9/20+320/20) =4/(329/20) =4*20/329 =80/329 = 0.2432

37.5℅x+1oo=5o℅x 解:50%x-37.5%x=100 12.5%x=100 x=100÷12.5% x=800

45℅x-45=18 0.45x=63 x=140

37%x-20%x=3.4 17%x=3.4 x=3.4÷17% =3.4*100/17 =20 未知数是20

x-58+ 12=36℅x 解:x-46=0.36x x-0.36x=46 0.64x=46 x=46÷0.64 x=71.875

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