求高手解答a*b=a^2-b^2-2b÷(a-b) - 知识问答

求高手解答a*b=a^2-b^2-2b÷(a-b),求(-2)*1/2

1个回答

(-2)*1/2
=(-2)²-(1/2)²-2×(1/2)÷[(-2)-1/2]
=4-1/4-1÷(5/2)
=4-1/4-1×2/5
=4-1/4-2/5
=80/20-5/20-8/20
=67/20

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