作业帮1200/x-1200/（x+2）=30
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1200/x-1200/（x+2）=30
1200/x-1200/（x+2）=30
1200/x-1200/（x+2）=30
1200/x-1200/（x+2）=30
40(x+2)-40x=x(x+2)
40x+80-40x=x²+2x
x²+2x-80=0
(x+10)(x-8)=0
x1=-10,x2=8
(35-X)(30-2X)中X是多少(35-X)(30-2X)=1200
1200/x-2-1200/x=30
1200/x-1200/（x+2）=30
x^2-10x-1200=0如何变为（x-40)(x-30)
60(30x)=40x+20(30+x)+1200
(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
1440×（x-1）=1200x x等于多少
X-40%X+1200=2/3X怎么算
看下题!1500/x-(300/x+1200/2x)=4
1200（7-x）=1500x
(40-X)(20+2X)=1200
(20+2x)(40-x)=1200
（20+2x)(40-x)=1200
(40-x)(20+2x)=1200
(40-x)(20+2x)=1200
(20+2x)(40-x)=1200
(40-x)(20+2x)=1200
X^2+10x-1200=0