3-[3(X+2Y)-3( )}=-6X-6Y,括号中填什么啊?

问题描述:

3-[3(X+2Y)-3( )}=-6X-6Y,括号中填什么啊?

3-[3(X+2Y)-3( )}=-6X-6Y 3+6X+6Y=3(X+2Y)-3( ) 3( )=3X+6Y-(3+6X+6Y) 3( )=-3-3X ( )=-1-X