计算：(-2x)^4·x^5-15(x^6)^2/x^3

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) 计算：(-2x)^4·x^5-15(x^6)^2/x^3 计算：4x(x^2-2x-1)+x(2x+5)(5-2x) 计算：(x-1)(x^2-4X+3)-x(x^2-5X+2)有过程 计算：(2x+3)(3x-4)>(x+1)(x-1)+5x(x+3)+7 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(x-2)/(x^2-4)+(x-4)/(x^2-5x+4)-(2x+1)/(x^2+x-2) 用简便方法计算 （x-2)(x-3)+(x-4)(x-5)+(x-2)(x-4)+(x-3)(x-5) 如何计算（x-1)(x-2)(x-3)(x-4)-(x^2-5x)^2-10(x^2-5x) 2x*4x-3x计算 计算(x+2)/(x+1) - (x+3)/(x+2) + (x+4)/(x+3) - (x+5)/(x+4) 计算（x*x+4x+5）/（x+2）-（x*x+6x+10）/（x+3）+1 计算x-2/5x+120=3/4x 计算：x(2x-5)=4x-10 2x*(-x)4次方+(-x)5次方计算 2x^5·x^5+（-x）²·x·（-x)³计算 4x²-1/3x²-x·9x³-x/2x^4-x³计算 急