(-0.25)x(-2)x(-5/12)x(+0.8)
(x+12)(x-2)+(x+7)(x+8)-(x+5)(x-10),其中x=2
(2x^-5x+2/6x^+13x+6)*(6x^-5x-6/6x^-17x+10)*(12x^+8x-15/2x^-x
求1/2x^2-1/4x+0.2x^3+0.25x-0.5x^2-1/5x^3+0.5x-1 其中x=12/13
(x-2)(x-3)+2(x-5)(x+6)-3(x^2-7x+12)
(x+2)(x-12)+(x+7)(x+8)+(x+5)(x-10),化简.
1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550
2x-6/x^2-4x+4除以12-4x/x^2+5X-6除以x^2+5x+6/x^2-5x-6
通分x+4/x*x+4x与x-5/x(x-5)-2(x-5)
x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x
x+2/x+1-x+3/x+2-x+4/x+3+x+5/x+4
x/x-3-5x/x^2-x-6计算
((x²-5x+6)/(12-7x+x²))²÷((x²+3x+2)/(x