(6a²-2ab)-2(3a²+4ab-1/8b²),其中a=1/5,b=-1
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![(6a²-2ab)-2(3a²+4ab-1/8b²),其中a=1/5,b=-1](/uploads/image/z/1998790-70-0.jpg?t=%EF%BC%886a%26%23178%3B-2ab%EF%BC%89-2%EF%BC%883a%26%23178%3B%2B4ab-1%2F8b%26%23178%3B%EF%BC%89%2C%E5%85%B6%E4%B8%ADa%3D1%2F5%2Cb%3D-1)
(6a²-2ab)-2(3a²+4ab-1/8b²),其中a=1/5,b=-1
(6a²-2ab)-2(3a²+4ab-1/8b²),其中a=1/5,b=-1
(6a²-2ab)-2(3a²+4ab-1/8b²),其中a=1/5,b=-1
原式=6a2-2ab-6a2-8ab+1/4b2=-10ab+1/4b2 将a=1/5 b=-1带入
=2+1/4=2.25