5x²-[(x²+5x²-2x)-2(x²-3x)]化简
x(2x-1)=-3x(x+1)+5x²+3
计算:2x/(x-2)(x+1)÷(1-x/x+1)-x²+2x/x²-4?
5x²-[(x²+5x²-2x)-2(x²-3x)]化简
(x-2)(x-3)+2(x+6)(x-5)-3(x²-7x+13)化简
(﹣x+2x²+5)+(4x²-3-6x)
f(x)=-x²+2x x∈(2-5)最大值与最小值
2x²-5x+x²+4x-3x² -3x²y+2xy²+3xy
4x²-{-3x²-[5x-x²-(2x²-x)]+4x},其中x=½
通分:x+2/x²-2x,x-1/x²-4x+4
x(x²-1)+2x²(x+1)-3x(2x-5)计算
化简求值 :2x(x²-x+1)-x(2x²+2x-3) x=﹣二分之一
(﹣x²+2x+5)+(4x²-3-6x)