1/(x^2-13x+42)+1/(x^2-14x+48)+1/(x^2-15x+56)

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1/(x^2-13x+42)+1/(x^2-14x+48)+1/(x^2-15x+56)1/(x^2-13x+42)+1/(x^2-14x+48)+1/(x^2-15x+56)1/(x^2-13x+4

1/(x^2-13x+42)+1/(x^2-14x+48)+1/(x^2-15x+56)
1/(x^2-13x+42)+1/(x^2-14x+48)+1/(x^2-15x+56)

1/(x^2-13x+42)+1/(x^2-14x+48)+1/(x^2-15x+56)
1/(x²-13x+42)+1/(x²-14x+48)+1/(x²-15x+56)
=1/[(x-6)(x-7)]+1/[(x-6)(x-8)]+1/[(x-7)(x-8)]
=[(x-8)+(x-7)+(x-6)]/[(x-6)(x-7)(x-8)]
=(3x-21)/[(x-6)(x-7)(x-8)]
=3(x-7)/[(x-6)(x-7)(x-8)]
=3/[(x-6)(x-8)]
=3/(x²-14x+48)
如果是化简,继续：
=3/[(x-6)(x-8)]
=(3/2)[1/(x-6)-1/(x-8)]

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我建议你用各个击破还有尖子生教材，特别哟创意！ ytt 1)x^2-答案：x1=-10 x2=-9 (15)x^2-25x+156=0 答案：x1=13 x2=12

解方程((13x-x^2)/(x+1))(x+(13-x)/(x+1))=42 (13x-x^2)/(x+1)[x+(13-x)/(x+1)]=42 *-----------------------------------------------*| 6 4 X | 8 X X | X X 5 || X X X | X X X | X 7 8 || X X X | X X X | X X X ||---------------+---------------+--------------- || X X X | X X X | 5 1 X || X X X | X 6 X | X X X || 8 X X | 3 5 X | 2 X X || 填九宫格帮帮忙.x x 6 x x 7 x x 98 x x x 3 x 1 x x 9 x x 6 x 5 x 3 x x x 3 x x x x 1 8x x x 9 x 1 x x x2 1 x x x x 6 x x x 6 x 7 x 3 x x 1 x x 9 x 2 x x x 47 x x 8 x x 5 x x 七年级下册政治复习提纲(山东人民出版社)第五单元是青春的脚步青春的气息别弄错了啊!格式：X X X X X X X X X 1、X X X X X X X X X X.2、X X X X X X X X X.3、X X X X X X X X X X X. 分解因式----（X*X-X)(X*X-X-2)+1 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 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) [(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)] 解分式方程：1/X-2+1/X-6=1/X-7+1/X-11/X-2+1/X-6=1/X-7+1/X-11/(x-2)-1/(x-1)=1/(x-7)-1/(x-6)(x-1-x+2)/(x-2)(x-1)=(x-6-x+7)/(x-7)(x-6)1/(x-2)(x-1)=1/(x-7)(x-6)(x-2)(x-1)=(x-7)(x-6)x^2-3x+2=x^2-13x+4213x-3x=42-210x=40x=4 为什么要移向才能解】x(x+1)+x^2(x-1) 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 1、|x-|3x+6||>42、|2x-|x-2|| 计算1、（x^2+13x+42)/(x+6) 因式分解(x-1)(x+2)(x+3)(x+6)-13 (x-1)(x+2)(x+3)(x+6)-13 解方程:x+1分之13x-x^2*(x+(x+1分之13-x))=42 计算：1/（x^2-13x+42）+1/（x^2-15x+56)+1/(x^2-17x+72)