填空-5/7x=( )/7x=5/( ) x-y/x+y=X^2-y^2/( )

分类: 作业答案 • 2022-01-19 12:12:42

问题描述：

填空-5/7x=( )/7x=5/( ) x-y/x+y=X^2-y^2/( )
填空-5/7x=( )/7x=5/( ) x-y/x+y=X^2-y^2/( )

答

-5/7x=(-5 )/7x=5/( -7x )
x-y/x+y=X^2-y^2/(x+y)²