2x²-7x+3
(x-2)(x-3)+2(x+6)(x-5)-3(x²-7x+13)化简
((x²-5x+6)/(12-7x+x²))²÷((x²+3x+2)/(x
|X-1|+|X-2|+|X-3|+|X-4|+|X-5|+|X-6|+|X-7|+|X-8|+|X-9|+|X-10|
3-2x²+3x+3x²-5x-2x²-7
x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少?
已知多项式3-2x²+3x+3x²-5x-x²-7
3x(x²+2x+7)-(x²+7)(3x-5)
3x²-{7x-(4x-3)-2x²=?注:x=未知数.
(x+1)(2x-3)-(x-1)(x+2)=x²+7,解方程,
2x^6×x³-3x^9+5x²×x^7等于多少
3x⁷*x⁴+2x*x²*x⁴-4x⁵*(-x)²
2x+3x+4x+5x+x+6x+7x=100