就几题,1.计算(x^2+5x+7)/(x+2)-(x^2+7x+11)/(x+3) 2.(b^3/a^3-a^3/b^3)/(b^3/a^3+a^3/b^3-2)/2.(b^3/a^3-a^3/b^3)/[(b^3/a^3)+(a^3/b^3)-2]/[1+(a^3/b^3)]

计算(x-2)(x-3)+2(x+6)(x-5)-3(x平方-7x+13) 计算：(2x+3)(3x-4)>(x+1)(x-1)+5x(x+3)+7 计算：x^2-5x+6/x^2-x-2x^2-7x+12/x^2-2x-8 计算：x^2-5x+6/x^2-x-2x^2-7x+12/x^2-2x-8 计算:[(x+2)/(x+3) - (x+1)/(x+2) + (x+4)/(x+5) - (x+3)/(x+4) / (x^2 + 7x + 13)/(x^2 + 8x + 15) x/x-3-5x/x^2-x-6计算 计算:x/x-2 - 5x/x²-x-6计算:x/x-3 - 5x/x²-x-6 计算(3-x)/(1-x)+(x^2-2)/(x^2-8x+7)=1+(5-x)/(7-x) (x-2)(x+7)-2(3-x)(2+x) 计算 (x+5)(x+6)(x+7)(x+8) 简便计算 计算：(x+7)(x-6)-(x-2)(x+2) 计算：5x(x-2)-(x-2)(2x-3) 计算(1/x²+3x+2)+(1/x²+5x+6)+(1/x²+7x+12) 计算[(x-1)/(x-2)-(x-2)(x-3)-(x-3)/(x-4)+(x-4)(x-5)]/(2x-7)快 计算:(5x^2-4x+1)-(2x^2-5x+7) 5+7x-6x^2＞0怎么计算? (2/3x+7)/x=6/5 计算 （2x+7）×（3x-4)+（3x+5）×（3x-2）计算 计算(3x³-2-5x)(6-7x+2x²)拜托了