先化简,在求值:3a²-ab/9a²-6ab+b²,其中a=-8,b=1/2.
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![先化简,在求值:3a²-ab/9a²-6ab+b²,其中a=-8,b=1/2.](/uploads/image/z/1584416-56-6.jpg?t=%E5%85%88%E5%8C%96%E7%AE%80%2C%E5%9C%A8%E6%B1%82%E5%80%BC%EF%BC%9A3a%26%23178%3B-ab%2F9a%26%23178%3B-6ab%2Bb%26%23178%3B%2C%E5%85%B6%E4%B8%ADa%3D-8%2Cb%3D1%2F2.)
先化简,在求值:3a²-ab/9a²-6ab+b²,其中a=-8,b=1/2.
先化简,在求值:3a²-ab/9a²-6ab+b²,其中a=-8,b=1/2.
先化简,在求值:3a²-ab/9a²-6ab+b²,其中a=-8,b=1/2.
3a²-ab/9a²-6ab+b²
=a(3a-b)/(3a-b)²
=a/(3a-b)
=-8/(-24-1/2)
=-16/(-48-1)
=16/49