-9(x-2)-(x-5)怎么算!化简就好了

-9(x-2)-(x-5)怎么算!化简就好了 x^2-6x+9/x^2-x-6 * x^2-7x+10/x^2-9 * x+3/2(x-5)怎么算? (x^2-3x+1)^3怎么算出x^6-9x^5+30x^4-45x^3+30x^2-9x+1 (x-1)(x-2)(x-3)(x-4)-(x^2-5x)^2-10(x^2-5x)怎么算? (x-9)(x+2)>0怎么算 x^2=9x 怎么算 2X=5X怎么算? 2x=5x 怎么算 X-2/5X=9怎么算 X÷5=(X-9)÷2怎么算 (x/2+20)=5x/9怎么算 5x-2x=9怎么算? 6(x+2)=9x(X-2)怎么算 (x+5)^2=10+（x+5)x怎么算 1+x+x^2+x^3+x^4+x^5+x^6+x^7+x^8+x^9+x^10+x^11+x^12=97.8x+x^2+x^3+x^4+x^5+x^6+x^7+x^8+x^9+x^10+x^11+x^12=97.8 好多年没有用过过数学公式了 想不起来怎么算了 想知道 X值是多少 1/(x+1)(x+2)+1/(x+3)(x+4)+1/(x+5)(x+6)+1/(x+7)(x+8)+1/(x+9)(x+10)怎么解 X X 8 9 5 X X X 6 九宫格怎么算 lim (x->1) (x^2-6x+8)/(x^2-5x+4) 怎么算?