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

x+五分之一x=240 6/5x=240 x=200 x-60%x=160 0.4x=160 x=400 50%x-33%x=34 0.17x=34 x=200 120x-20x=40 100x=40 x=0.4 x+130%x=460 2.3x=460 x=200

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(1)30%x=120, 30%x÷30%=120÷30%, x=400;(2)x+35%x=240, 1.35x=240,1.35x÷1.35=240÷1.35, x= 4800 27 ;(3)30x-60%x=160, 0.4x=160, 0.4x÷0.4=160÷0.4, x=400;(4)50%x-33%x=34, 17%x=34, 17%x÷17%=34÷17%, x=200;(5)120...

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

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

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

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