-a(a²-2ab)-b(ab+2a²-b²),其中a=2,b=1/2
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![-a(a²-2ab)-b(ab+2a²-b²),其中a=2,b=1/2](/uploads/image/z/4080232-64-2.jpg?t=-a%28a%26%23178%3B-2ab%29-b%28ab%2B2a%26%23178%3B-b%26%23178%3B%29%2C%E5%85%B6%E4%B8%ADa%3D2%2Cb%3D1%2F2)
-a(a²-2ab)-b(ab+2a²-b²),其中a=2,b=1/2
-a(a²-2ab)-b(ab+2a²-b²),其中a=2,b=1/2
-a(a²-2ab)-b(ab+2a²-b²),其中a=2,b=1/2
-a(a²-2ab)-b(ab+2a²-b²)
= -a³+2a²b-ab²-2a²b+b³
= -a³-ab²+b³
= -2³-2×(1/2)²+(1/2)³
= -8-1/2+1/8
= -67/8