(18-2x)X(10-x) 怎么算?

(18-2x)X(10-x) 怎么算? (x-1)(x-2)(x-3)(x-4)-(x^2-5x)^2-10(x^2-5x)怎么算? 2x x=18怎么算 2x+x=10 怎么算? x^3-18x^2+81x,怎么算? (x+5)^2=10+（x+5)x怎么算 (x^10-x^5+1)/(x^2+x+1) 怎么算?(x^10-x^5+1)/(x^2+x+1)=（x^8-x^7+x^5-x^4+x^3-x+1) x^2-6x+9/x^2-x-6 * x^2-7x+10/x^2-9 * x+3/2(x-5)怎么算? x^2-x-60怎么算x^2-x-6 x^2=(x+30)X(x-18)怎么解 (x+2)(x+3)-(x+6)(x-1) 怎么算? (x-3)/(x^2+3x+2)×(x^2)/(x^2-4x+3)怎么算？ 2*x*x*x-6x*x+18x怎么因式分解? x^2+9x=10x+9 怎么算的10x+9 10（x-2）+x=3x（x-2)怎么算? 已知函数f(x)=(2+5x)^10/x,则f‘(x)=?怎么算? 1/(1-x)+1/(1+x)+2/(1+x*x)+4/(1+x*x*x*x)+8/(1-x*x*x*x*x*x*x*x)怎么做 (x^2-x)^2-18(x^2-x)+72(x+1)(x+2)-x-10