4x²-4x+1=x²+6x+9
4x-2=3x+1 -x+3=10 x-7=11-x x=四分之一x+6
化简求值 :2x(x²-x+1)-x(2x²+2x-3) x=﹣二分之一
解方程:1.60%+25=40 2.X-10%X=18 3.x+30%X=52 4.(1-25%)X=36
x(2x-1)=-3x(x+1)+5x²+3
有例子x²+6x-7|| ||x × 7=7x\ =6xx × -1=-x/(x-1)(
已知x²+4x-1=0,求2x四次方﹢8x³-4x²-8x+1
x*x+2x+x*x+10x+x*x+25+2x+x*x+1+1+16+x*x+4x*x+9-12x+16x*x+4-1
通分:x+2/x²-2x,x-1/x²-4x+4
﹣(x²-5-4x)-x(x²+x-1),其中x=-1.先化简再求值
x²-3x+1=0
先化简,再求值2x²【x²-x 1】-x【2x³-10x²+2x】,其中x=二分