Question

化简下列各式

﹙1﹚3b²-﹙a²+b²﹚-b² ﹙2﹚x+﹙2x-1﹚-﹙x/3+3﹚ ﹙3﹚-2﹙ab﹣3a²﹚＋﹙5ab-a²﹚ ﹙4﹚﹣﹙b-4﹚+4﹙-b-3﹚ ﹙5﹚2a²-1/2﹙ab+a²﹚8ab ﹙6﹚1/2﹙x²-y﹚＋1/3﹙x-y²﹚+1/6﹙x²+y²﹚

Answer 1

答：
﹙1﹚
3b²-﹙a²+b²﹚-b²
=3b²-a²-b²-b²
=b²-a²

﹙2﹚
x+﹙2x-1﹚-﹙x/3+3﹚
=x+2x-1-x/衫凯3-3
=8x/3-4

﹙3﹚
-2﹙ab﹣3a²﹚＋﹙5ab-a²﹚
=-2ab+6a²+5ab-a²
=5a²+3ab

﹙4﹚
﹣﹙b-4﹚+4﹙-b-3﹚
=-b+4-4b-12
=-5b-8

﹙5﹚
2a²-1/2﹙ab+a²﹚8ab
=2a²-4a²b²-4a³b

﹙6﹚
1/2﹙x²-y﹚＋1/3﹙x-y²﹚+1/6﹙x²+y²﹚
=x²/2-y/2+x/仔游3-y²或戚唤/3+x²/6+y²/6
=2x²/3-y²/6+x/3-y/2