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+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