6a²-5a(-a+2b+1)+4a(-3a-5/2b-3/4),其中a=-1,b=1/20.
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![6a²-5a(-a+2b+1)+4a(-3a-5/2b-3/4),其中a=-1,b=1/20.](/uploads/image/z/129212-44-2.jpg?t=6a%26%23178%3B-5a%EF%BC%88-a%2B2b%2B1%EF%BC%89%2B4a%EF%BC%88-3a-5%2F2b-3%2F4%EF%BC%89%2C%E5%85%B6%E4%B8%ADa%3D-1%2Cb%3D1%2F20.)
6a²-5a(-a+2b+1)+4a(-3a-5/2b-3/4),其中a=-1,b=1/20.
6a²-5a(-a+2b+1)+4a(-3a-5/2b-3/4),其中a=-1,b=1/20.
6a²-5a(-a+2b+1)+4a(-3a-5/2b-3/4),其中a=-1,b=1/20.
6a²-5a(-a+2b+1)+4a(-3a-5/2b-3/4)
=6a²+5a²-10ab-5a-12a²-10ab-3a
=-a²-20ab-8a
=-1+1+8
=8