x一（35%x+35%x+10）=38用方程解,

x一（35%x+35%x+10）=38用方程解, 35（x一2）一15（5x一6）= 22x一63一21（3x一4） 35（x一2）一15（5x一6）=22x一63一21（3x一4） 3x一2x(10一x)=15 3X一（2一X）=5X 9X一X一X= (2x+3)=7/9(5X一35) 3x一（10-x）=12. 10%x十（120一x）X12%=13 10x-(12-4x)-(10+35x)=15x-(9x-18) x+35=(x+3x)*30% 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 1、x^2+10x+21=02、x^2-x-1=03、3x^2+6x-4=04、3x（x+1）=3x+35、4x^2-4x+1=x^2+6x+96、7x^2-√6x-5=0 1/(x^2一4x十3)十1/(x^2一8x十15)十1/(x^2-12x十35)十1/(x^2一16x十63)= 10X-35 =9 -6X 求x x+x÷5+（x+35）=112 （1）解方程：1/X+1/X(X+1)+1/(X+1)(X+2)+1/(X+2)(X+3)+.+1/(X+9)(X+10)=0（2）计算：1/(X+2)+1/(X+1)(X+3)+1/(X+2)(X+4)+.+1/(X+2007)(X+2009)一楼的：题没有错唉~二楼的： =(x^2-5x)^2+10(x^2-5x)+24 =x^4-10x^3+25x^2+10x^2-50x+24 这是怎么转化的(X-1)(X-2)(X-3)(X-4) =(X-1)(X-4) (X-2)(X-3)=（x^2-5x+4)(x^2-5x+6)=(x^2-5x)^2+10(x^2-5x)+24=x^4-10x^3+25x^2+10x^2-50x+24=x^4-10x^3+35x^2-50x+24