5X²-6X+1-( )=7X+8
问题描述:
5X²-6X+1-( )=7X+8
( )里面填什么
答
5X²-6X+1-( 5x²-13x-7)=7X+8
()=5x²-6x+1-(7x+8)=5x²-13x-7