50x+400=60x-30
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50x+400=60x-30
60x(x-4)=30x
30%x=50%x-20x
60x-300=50x+400
50x+400=60x-300
50%x+x=20 x+30%x=52
50x(x-1)+60x(x-4)=5100
x-60%x-25%x=25%x-30
x+50%x=400
六题解方程:x+75%x=140 x-40%x=96 x-76%x=36 4x+50%x=90 60%x-30=120 x+50%x=45
x+(30-x)=60
x除55%=100 60%x=30 x+50%x=4.5 (1-25%)x=72 4x+40%x=176 解方程
x+ x+(x*50%)=1.5X?
(x+30)*(x-18)=x*x
X-X/12-X/7-X/8-X/4-X/20-X/5-30-120-300=50解方程
解方程 40%x=12 (1+60%)x=24 (1-37.5%)x=10 2x+50%x=20 40%x+30%x=140 35%x-15%x=72
50%x=75 x-40&x=120 15x-30=150 60%x-35%x=125 x+15%x=115 8x+42=178 帮忙解一下
(40-x)(20+2x)=1200 800+80X-20X-2x^2=1200 -2x^2+60X-400=0 x^2-30X+200=0 (X-10)(X-20)=0 X-10=0 X-20=0(X-10)(X-20)=0 40-x)(20+2x)=1200 800+80X-20X-2x^2=1200 -2x^2+60X-400=0 ^2-30X+200=0 (X-10)(X-20)=0