(-X+2X²+5)+(4X²-3-6X)=?
4x²-{-3x²-[5x-x²-(2x²-x)]+4x},其中x=½
(1) x-3/x-2 - x-5/x-4=x-7/x-6 - x-9/x-8
x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少?
2x+3x+4x+5x+x+6x+7x=100
(-X+2X²+5)+(4X²-3-6X)=?
(x+4)(3x+6)=2x+4 (3x- 1)²+4x²=0 x²+5=2根号6x-1
5x²+4-3x²-5x-2x²-5+6x,其中,x=-3
(x+1-1/1-x)÷(x-x²/x-1) (x-4/x-x-6+ x+2/x-3)÷x+1/x-3
4x/(x²+x+3) + 5x/(x²-5x+3)= - 3/2
5(x²+x-3)-4x(6+x)+x(-x+4)=0
计算[(x²-5x+6)/(x²-4x+3)]+[(x²-4x+3)/(x²-2
9x+6x²-3(x-2/3x²),其中x=-2 1/4(-4x²+2x-8)-(1/2x