(5x-3)(5x+3)-(3x+7)(7-3x) ,
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!)+.
|X-1|+|X-2|+|X-3|+|X-4|+|X-5|+|X-6|+|X-7|+|X-8|+|X-9|+|X-10|
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
已知3x*x-x=1,求6x*x*x+7x*x-5x+2000
x+2x-3x-4x+5x+6x-7x.-196x+197x+198x-199x-200x 等于多少
填九宫格帮帮忙.x x 6 x x 7 x x 98 x x x 3 x 1 x x 9 x x 6 x 5 x 3 x
(x-2)(x-3)/(x+5)(x-7)>0
因式分解 (x+1)(x+3)(x+5)(x+7)+15
换元法 (x+1)(x+3)(x+5)(x+7)+15
(x-1)(x-3)(x-5)(x-7)-9 因式分解
已知1+x+x^2+x^3=0,求x+x^2+x^3+x^4+x^5+x^6+x^7+x^8的值