5x²-【7x-(4x-3)-2x²】

4x²-{-3x²-[5x-x²-(2x²-x)]+4x},其中x=½ |X-1|+|X-2|+|X-3|+|X-4|+|X-5|+|X-6|+|X-7|+|X-8|+|X-9|+|X-10| (x-2)(x-3)+2(x+6)(x-5)-3(x²-7x+13)化简 x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少? 3x⁷*x⁴+2x*x²*x⁴-4x⁵*(-x)² 2x+3x+4x+5x+x+6x+7x=100 (x+1-1/1-x)÷(x-x²/x-1) (x-4/x-x-6+ x+2/x-3)÷x+1/x-3 计算[(x²-5x+6)/(x²-4x+3)]+[(x²-4x+3)/(x²-2 (（x²-5x+6)/(12-7x+x²))²÷((x²+3x+2)/(x
x+2x-3x-4x+5x+6x-7x.-196x+197x+198x-199x-200x 等于多少 3-2x²+3x+3x²-5x-2x²-7 已知多项式3-2x²+3x+3x²-5x-x²-7