(-3.85)x(-13)+(-13)x(-6.15)+0.79x7/15+8/15x0.79简便运算999+24/25x(-5)

4x+9x=13x X+13%X-28%X=3. x+13%x-28%x=3.4 13x-6.8x+x=46. 13x-15x+x=-3 x*x-10*x=13急 35道.符号^代表平方.读起来就是（X的平方）.1,x^-x-202,x^-9x+203,x^-9x-204,x^+9x+205,x^-18x+326,x^+14x-317,x^+18x+328,x^+14x-329,x^+19x+4810,x^+47x-4811,x^+13x-4812,x^+2x-4813,x^+26x+4814,x^-22x-4815,x^+17x+7216,x^+21x-10017,x^-x-7218,x [(x+2)/(x+3)-(x+1)/(x+2)+(x+4)/(x+5)-(x+3)/(x+4)]/[(x的平方+7x+13)/(x的平方+8x+15)] 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) 10x+[13-x]+9=10[13-X]+X (13-x)*10+x+27=10x+13-x 因式分解(x-1)(x+2)(x+3)(x+6)-13 2*x*x+2.5x=13 x=? 13x-6.3x+x=46.8 x=多少 (x-1)(x+2)(x+3)(x+6)-13 x+5.5x=13 (x-10)/(x-11)+(x-16)/(x-17)=(x-12)/(x-13)+(x-14)/(x-15)快,急用 3(x^4)^6-2(x^5×x^3)^3+x^11×x^13+x^20×x^3×x