240-X=0.4(0.5X)
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240-X=0.4(0.5X)240-X=0.4(0.5X)240-X=0.4(0.5X)240-x=0.2x240=1.2xx=200
240-X=0.4(0.5X)
240-X=0.4(0.5X)
240-X=0.4(0.5X)
240-x=0.2x
240=1.2x
x=200
240-X=0.4(0.5X)
0.5x(x+4)-0.4(x+4)=3.2
解方程 x-25-(x-25)*0.4=0.5x
x/0.5-0.4x-0.6/0.2=2(-x+3)
0.5(x+0.4)=x-1.
0.3x+0.65=0.4x+0.5
(2000*0.4)+x /(2000+x )=0.5
0.5x+0.4(15-x)=7
0.4(x+9)=0.5(10.8-x)
（X+X)+(X-X)+(X*X)+(X/X)=100
x-0.8x=0.4x=?
0.5X+120+0.3X=X
4X+0.5X=13.5X
x-30-0.2x=0.5x
x-0.3x-0.5x=20
9x+0.5x+x=
0.5x(x+4)-0.4(x+4)=3.2 x是多少
(0.4x+0.9)/0.5-(0.03+0.02x)/0.03=(x-5)/2 x等于多少?