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?](/uploads/image/z/2591990-62-0.jpg?t=1%2F2%EF%BC%88A%26%23178%3B-B%EF%BC%89%2B1%2F3%28A-B%26%23178%3B%EF%BC%89%2B1%2F3%EF%BC%88A%26%23178%3B%2BB%26%23178%3B%EF%BC%89+%E7%AD%89%E4%BA%8E%E5%A4%9A%E5%B0%91%3F)
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