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