先化简后求值:【(ab+3)(ab-3)-3(a²b²-3)】÷(ab),其中a=-½,b=1/3
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![先化简后求值:【(ab+3)(ab-3)-3(a²b²-3)】÷(ab),其中a=-½,b=1/3](/uploads/image/z/5433824-56-4.jpg?t=%E5%85%88%E5%8C%96%E7%AE%80%E5%90%8E%E6%B1%82%E5%80%BC%EF%BC%9A%E3%80%90%EF%BC%88ab%2B3%EF%BC%89%EF%BC%88ab-3%EF%BC%89-3%EF%BC%88a%26%23178%3Bb%26%23178%3B-3%EF%BC%89%E3%80%91%C3%B7%EF%BC%88ab%EF%BC%89%2C%E5%85%B6%E4%B8%ADa%3D-%26%23189%3B%2Cb%3D1%2F3)
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先化简后求值:【(ab+3)(ab-3)-3(a²b²-3)】÷(ab),其中a=-½,b=1/3
先化简后求值:【(ab+3)(ab-3)-3(a²b²-3)】÷(ab),其中a=-½,b=1/3
先化简后求值:【(ab+3)(ab-3)-3(a²b²-3)】÷(ab),其中a=-½,b=1/3
原式=[a²b²-9-(3a²b²-9)]÷(ab)
=(a²b²-9-3a²b²+9)÷(ab)
=(-2a²b²)÷(ab)
=-2ab
=-2×(-1/2)×(1/3)
=1/3