先化简在求值{(a+1/2b)²+(a-1/2b)²}*(2a²-1/2b²)其中a=-3 b=4
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![先化简在求值{(a+1/2b)²+(a-1/2b)²}*(2a²-1/2b²)其中a=-3 b=4](/uploads/image/z/3819527-71-7.jpg?t=%E5%85%88%E5%8C%96%E7%AE%80%E5%9C%A8%E6%B1%82%E5%80%BC%EF%BD%9B%EF%BC%88a%2B1%2F2b%29%26%23178%3B%2B%28a-1%2F2b%29%26%23178%3B%EF%BD%9D%2A%EF%BC%882a%26%23178%3B-1%2F2b%26%23178%3B%EF%BC%89%E5%85%B6%E4%B8%ADa%3D-3+b%3D4)
先化简在求值{(a+1/2b)²+(a-1/2b)²}*(2a²-1/2b²)其中a=-3 b=4
先化简在求值{(a+1/2b)²+(a-1/2b)²}*(2a²-1/2b²)其中a=-3 b=4
先化简在求值{(a+1/2b)²+(a-1/2b)²}*(2a²-1/2b²)其中a=-3 b=4
原式=(a²+ab+1/4b²+a²-ab+1/4b²)*(2a²-1/2b²)
=(2a²+1/2b²)(2a²-1/2b²)
=4a^4-1/4b^4
=4*81-1/4*256
=324-64
=260