20/(x-20)=(2x-40)/(x+40)
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20/(x-20)=(2x-40)/(x+40)20/(x-20)=(2x-40)/(x+40)20/(x-20)=(2x-40)/(x+40)两边除以210/(x-20)=(x-20)/(x+40)
20/(x-20)=(2x-40)/(x+40)
20/(x-20)=(2x-40)/(x+40)
20/(x-20)=(2x-40)/(x+40)
两边除以2
10/(x-20)=(x-20)/(x+40)
两边乘(x-20)(x+40)
x²-40x+400=10x+400
x²-50x=0
x(x-50)=0
x=0,x=50
(X+X*20%)-[(1200-X)-(1200-X)*20%]=40%
X+X*20%-(1200-X)-(1200-X)*20%=40%
(20-2x)(20-2x)x>400 x=?
20/(x-20)=(2x-40)/(x+40)
x-10+X+20+X/2+2X=370
x+10+x-20+2x+x/2=370
x/2+x/8+x/12+x/20=1
x(x+2)(x+6)+20x+6=0
(2-x)(6-x)(12-x)(20-x)=
x+20%x =40
x+(x-20)=40
x+20%x=40
2x/40%=x+20x=?
X+(X+40)+(2X-20)=320
2(40-2x)(20-x)+2x(20-x)+2x(40-2x)=550怎么解
(40-X)(20+2X)=1200
(20+2x)(40-x)=1200
(20+2x)(40-x)=1200