60%x+400+(60%x+400)X70%x+50=x-250怎么解请快回答,就要交了.
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60x-300=50x+400
50x+400=60x-30
50x+400=60x-300
(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
x/(120-x)=(60-x)/60
400=x^2+(x+x)^2
x(x-1)(x+1)=60
x/(120-x)=x/60
60%X + 80%X - 12 = X
60x(x-4)=30x
7x-3x+x=60
x^3+12x+47x+60
x-(25%x+6)=60%x
800+60x-2x²=1200那个,60x-2x²=40060x-2x²-400=0这一步为什么就成了2x²-60x+400=0
(20-2x)(20-2x)x>400 x=?
(x+20)+x=60+x-(x+20)
X+X-6+X-4+X/2=60
x^2-x-60怎么算x^2-x-6