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解方程40% X+50%*(120%%X)=一又五分之二,4X +5×...

40%X=120 40x=12000 x=300 60%X-35%X=10 60x-35x=1000 25x=1000 x=40 X+110%X=42 100x+110x=4200 210x=4200 x=20 X-50%X=140 100x-50x=14000 50x=14000 x=280

(0.42-0.12)x=36 0.3x=36 x=36/0.3=360/3=120 x=120

①120%x-x=24 0.2x=24 0.2x÷0.2=24÷0.2 x=120 ②54-12%x=18 54-0.12x=1854+0.12x-0.12x=18+0.12x 18+0.12x=54 18-18+0.12x=54-18 0.12x=36 0.12x÷0.12=36÷0.12 x=300③65%x-35%x=210 0.3x=2100.3x÷0.3=210÷0.3 x=700

①75%X=120,0.75X=120,0.75X÷0.75=120÷0.75, X=160;②X+18%X=118,(1+18%)X=118, 1.18X=118,1.18X÷1.18=118÷1.18, X=100;③76%X-21%X=110,(76%-21%)X=110,0.55X=110,0.55X÷0.55=110÷0.55, X=200.

120减84%x等于40 120-0.84x=40 0.84x=80 x=8000/84 =200/21

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