(____)+3x²-5x+2=2x²-4x
(____)+3x²-5x+2=2x²-4x
4x²-{-3x²-[5x-x²-(2x²-x)]+4x},其中x=½
若x²+3x-2=0,则2x³+6x²-4x=____
x²-x____=(x-___)² 4x²+4x+____=(2x+____)²
x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x
4x/(x²+x+3) + 5x/(x²-5x+3)= - 3/2
f(x)=x²+3x|x-2|
(1) x-3/x-2 - x-5/x-4=x-7/x-6 - x-9/x-8
方程(2x²-3x+1)²=22x²-33x+1的解为____.
x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少?
先化简再求值:(x+2/x²-2x - x-1/x²-4x+4)÷ x-4/x,其中x=3/2
3X+(X+2)+(X+1)*(X-1)=4*(X²+8)