在2-【2(x+y)-()】=x+2,括号内应填
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在2-【2(x+y)-()】=x+2,括号内应填
在2-【2(x+y)-()】=x+2,括号内应填
在2-【2(x+y)-()】=x+2,括号内应填
2-【2(x+y)-()】=x+2
-【2(x+y)-()】=x
【2(x+y)-()】=-x
2(x+y)-()=-x
2(x+y)=-x+()
()=2(x+y)+x
()=2x+2y+x
()=3x+2y
2-【2(x+y)-()】=x+2
2-2(x+y)+()=x+2
()=x+2-2+2(x+y)=3x+2y
所以填3x+2y
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