3x(x²+2x+7)-(x²+7)(3x-5)
(x-2)(x-3)+2(x+6)(x-5)-3(x²-7x+13)化简
|X-1|+|X-2|+|X-3|+|X-4|+|X-5|+|X-6|+|X-7|+|X-8|+|X-9|+|X-10|
((x²-5x+6)/(12-7x+x²))²÷((x²+3x+2)/(x
x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少?
用递归法求y=x-(x*x*x/3!)+(x*x*x*x*x/5!)-(x*x*x*x*x*x*x/7!)+.
3-2x²+3x+3x²-5x-2x²-7
已知多项式3-2x²+3x+3x²-5x-x²-7
3x(x²+2x+7)-(x²+7)(3x-5)
2x^6×x³-3x^9+5x²×x^7等于多少
2x+3x+4x+5x+x+6x+7x=100
x+2x-3x-4x+5x+6x-7x.-196x+197x+198x-199x-200x 等于多少
解方程(x²-2)+2x²(x+3)-3x-(5x-7)=x(3x²-9x+17)+2