3xy-( )=5xy-2 x-(5x-3y)+( )=-2x+2y
问题描述:
3xy-( )=5xy-2 x-(5x-3y)+( )=-2x+2y
答
3xy-( 2-2xy)=5xy-2
x-(5x-3y)+( 2x-y)=-2x+2y
答
3xy-(-2xy+2 )=5xy-2
x-(5x-3y)+(2x-y )=-2x+2y