10x+x*x=40

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10x+x*x=40
10x+x*x=40

10x+x*x=40
x^2+10x=40
x^2+10x-40=0
(-b+-根号b^2-4ac)/2a
-10+-根号10^2+160/2
-10+-根号260/2
-10+-根号260/2
-10+-2根号65/2
x1=-5+根号65
x2=-5-根号65

10x+x*x=40 x-40%x= （X+X)+(X-X)+(X*X)+(X/X)=100 x*x*x*x*x=80000? (x+12)(x-2)+(x+7)(x+8)-(x+5)(x-10),其中x=2 (x+7/x+6) +(x+9/x+8)=9x=(x+10/x+9) +(x+6/x+5) 解方程(x/x(x+2))+(x/(x+2)(x+4))+.+x/(x+8)(x+10)=1 X+X+X+(X-1)+(X-2)+(X-3)+(X-4)=10(X-3)+(X-4) 40%x+(40%x-10)=x-30怎么解若|x-10|=4|x-40|,则x= x-40%x-40%x=15 x+40=2x x=? X×X+(40-X)=58 X乘以X等于40 ---------------------X=? (x+40%x)×85%-x=95 (x+40%x)×85%-x=95 4x+x=40x 40%x+70%x-x=1.8