先化简,再求值:(x-2)²-(x+2)(x-1),其中x=1; a²*a的4次方-a的8次方除以a²+(a的3次方)²,其中x=-1; (2a-b)²-b²,其中a=-2,b=3
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![先化简,再求值:(x-2)²-(x+2)(x-1),其中x=1; a²*a的4次方-a的8次方除以a²+(a的3次方)²,其中x=-1; (2a-b)²-b²,其中a=-2,b=3](/uploads/image/z/1022014-46-4.jpg?t=%E5%85%88%E5%8C%96%E7%AE%80%2C%E5%86%8D%E6%B1%82%E5%80%BC%EF%BC%9A%EF%BC%88x-2%EF%BC%89%26%23178%3B-%EF%BC%88x%2B2%EF%BC%89%EF%BC%88x-1%29%2C%E5%85%B6%E4%B8%ADx%3D1%EF%BC%9B+a%26%23178%3B%2Aa%E7%9A%844%E6%AC%A1%E6%96%B9-a%E7%9A%848%E6%AC%A1%E6%96%B9%E9%99%A4%E4%BB%A5a%26%23178%3B%2B%EF%BC%88a%E7%9A%843%E6%AC%A1%E6%96%B9%EF%BC%89%26%23178%3B%2C%E5%85%B6%E4%B8%ADx%3D-1%EF%BC%9B+%EF%BC%882a-b%EF%BC%89%26%23178%3B-b%26%23178%3B%2C%E5%85%B6%E4%B8%ADa%3D-2%2Cb%3D3)
先化简,再求值:(x-2)²-(x+2)(x-1),其中x=1; a²*a的4次方-a的8次方除以a²+(a的3次方)²,其中x=-1; (2a-b)²-b²,其中a=-2,b=3
先化简,再求值:(x-2)²-(x+2)(x-1),其中x=1; a²*a的4次方-a的8次方除以
a²+(a的3次方)²,其中x=-1; (2a-b)²-b²,其中a=-2,b=3
先化简,再求值:(x-2)²-(x+2)(x-1),其中x=1; a²*a的4次方-a的8次方除以a²+(a的3次方)²,其中x=-1; (2a-b)²-b²,其中a=-2,b=3
(x-2)²-(x+2)(x-1),
=x^2-4x+4-x^2-x+2
=-5x+5
=0
a²*a的4次方-a的8次方除以a²+(a的3次方)²,
=a^6-a^6+a^6
=a^6
=(-1)^6
=1
(2a-b)²-b²,其中a=-2,b=3
=4a^2-4ab+b^2-b^2
=4a^2-4ab
=4(-2)^2-4*(-2)*3
=40