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

(1)x+40%x=7 x=7/140%=5 (2)120%x-x=7 x=7/20%=35 (3)x-18%x=8.2 x=8.2/82%=10

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

(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...

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

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