快,急!
来源:学生作业帮 编辑:搜搜做题作业网作业帮 分类:数学作业 时间:2024/08/18 04:30:38
![](http://img.wesiedu.com/upload/3/d4/3d46539edcd3516e23bcdf10439ff3b0.jpg)
![快,急!](/uploads/image/z/19623057-33-7.jpg?t=%E5%BF%AB%EF%BC%8C%E6%80%A5%EF%BC%81)
解题思路: X-Y)平方+2XY-Y的平方除以X平方+7XY+Y平方 =[x²-2xy+y²+2xy-y²] / [x²+7xy+y²] =x² / [x²+7x*x/3+(x/3)²] =1/(1+7/3+1/9) =9/31
解题过程:
X-Y)平方+2XY-Y的平方除以X平方+7XY+Y平方
=[x²-2xy+y²+2xy-y²] / [x²+7xy+y²]
=x² / [x²+7x*x/3+(x/3)²]
=1/(1+7/3+1/9)
=9/31
解题过程:
X-Y)平方+2XY-Y的平方除以X平方+7XY+Y平方
=[x²-2xy+y²+2xy-y²] / [x²+7xy+y²]
=x² / [x²+7x*x/3+(x/3)²]
=1/(1+7/3+1/9)
=9/31