x^2-3/5x+12/7
(x-2)(x-3)+2(x-5)(x+6)-3(x^2-7x+12)
1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550
|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?
((x²-5x+6)/(12-7x+x²))²÷((x²+3x+2)/(x
(x+12)(x-2)+(x+7)(x+8)-(x+5)(x-10),其中x=2
2x+3x+4x+5x+x+6x+7x=100
化简:9x-12x+5x,3x-5x-2+5x+8,3x+5+2x+3-7-11x
x+2x-3x-4x+5x+6x-7x.-196x+197x+198x-199x-200x 等于多少
(1/x^2+3x+2)+(1/x^2+5x+6)+(1/x^2+7x+12)
x^2-3/5x+12/7
(x-2)(x-3)/(x+5)(x-7)>0