作业帮数学初二分式加减窝巢这是跪下不起了方程吃屎力直升不下答对了我可以加分哟【跪
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数学初二分式加减窝巢这是跪下不起了方程吃屎力直升不下答对了我可以加分哟【跪
数学初二分式加减
窝巢这是跪下不起了方程吃屎力直升不下
答对了我可以加分哟【跪
数学初二分式加减窝巢这是跪下不起了方程吃屎力直升不下答对了我可以加分哟【跪
x+1／x+2+x+6／x+7=x+2／x+3+x+5／x+6
1-【1/(x+2)】+1-【1/(x+7)】=1-【1/(x+3)】+1-【1/(x+6)】
1/(x+6)-1/(x+7)=1/(x+2)-1/(x+3)
1/(x+6)(x+7)=1/(x+2)(x+3)
(x+6)(x+7)=(x+2)(x+3)
13x+42=5x+6
8x=-36
x=-4.5
不懂的,可以继续问
(x+1)/(x+2)+(x+6)/(x+7)=(x+2)/(x+3)+(x+5)/(x+6)
[(x+2)-1]/(x+2)+[(x+7)-1]/(x+7)=[(x+3)-1]/(x+3)+[(x+6)-1]/(x+6)
(x+2)/(x+2)-1/(x+2)+(x+7)/(x+7)-1/(x+7)=(x+3)/(x+3)-1/(x+3)+(x+6)/(x+6)-1/(x+6)<...
全部展开
(x+1)/(x+2)+(x+6)/(x+7)=(x+2)/(x+3)+(x+5)/(x+6)
[(x+2)-1]/(x+2)+[(x+7)-1]/(x+7)=[(x+3)-1]/(x+3)+[(x+6)-1]/(x+6)
(x+2)/(x+2)-1/(x+2)+(x+7)/(x+7)-1/(x+7)=(x+3)/(x+3)-1/(x+3)+(x+6)/(x+6)-1/(x+6)
1-1/(x+2)+1-1/(x+7)=1-1/(x+3)+1-1/(x+6)
-1/(x+2)-1/(x+7)=-1/(x+3)-1/(x+6)
1/(x+2)+1/(x+7)=1/(x+3)+1/(x+6)
1/(x+2)+1/(x+7)=1/(x+3)+1/(x+6)
(x+7)/[(x+2)(x+7)]+(x+2)/[(x+2)(x+7)]=(x+3)/[(x+3)(x+6)]+(x+6)/[(x+3)(x+6)]
(x+7+x+2)/[(x+2)(x+7)]=(x+3+x+6)/[(x+3)(x+6)]
(2x+9)/[(x+2)(x+7)]=(2x+9)/[(x+3)(x+6)]
2x+9=0
2x=-9
x=-9/2
经检验x=-9/2是方程的俀
收起