1/2（A²-B）+1/3(A-B²）+1/3（A²+B²）等于多少?

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1/2（A²-B）+1/3(A-B²）+1/3（A²+B²）等于多少?1/2（A²-B）+1/3(A-B²）+1/3（A²+B&#

1/2（A²-B）+1/3(A-B²）+1/3（A²+B²）等于多少?
1/2（A²-B）+1/3(A-B²）+1/3（A²+B²）等于多少?

1/2（A²-B）+1/3(A-B²）+1/3（A²+B²）等于多少?
1/2（A²-B）+1/3(A-B²）+1/3（A²+B²）
=1/2A²-1/2B+1/3A-1/3B²+1/3A²+1/3B²
=(1/2+1/3)A²+1/3A +(1/3-1/3)B²-1/2B
=5/6A²-1/2B+1/3A

1/2（A²-B）+1/3(A-B²）+1/3（A²+B²）
=1/2A²-1/2B+1/3A-1/3B²+1/3A²+1/3B²
=5/6A²-1/2B+1/3A

1/2（A²-B）+1/3(A-B²）+1/3（A²+B²） 等于多少?

1/2（A²-B）+1/3(A-B²）+1/3（A²+B²）等于多少?