求(m-2n)²(m+2n)²-【(m-2n)²-(m+2n)²】² 当m=2,n=1时 的值简便点的,先化简 在求值
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![求(m-2n)²(m+2n)²-【(m-2n)²-(m+2n)²】² 当m=2,n=1时 的值简便点的,先化简 在求值](/uploads/image/z/2769907-67-7.jpg?t=%E6%B1%82%EF%BC%88m-2n%EF%BC%89%26%23178%3B%EF%BC%88m%2B2n%EF%BC%89%26%23178%3B-%E3%80%90%EF%BC%88m-2n%EF%BC%89%26%23178%3B-%EF%BC%88m%2B2n%EF%BC%89%26%23178%3B%E3%80%91%26%23178%3B+%E5%BD%93m%3D2%2Cn%3D1%E6%97%B6+%E7%9A%84%E5%80%BC%E7%AE%80%E4%BE%BF%E7%82%B9%E7%9A%84%EF%BC%8C%E5%85%88%E5%8C%96%E7%AE%80+%E5%9C%A8%E6%B1%82%E5%80%BC)
求(m-2n)²(m+2n)²-【(m-2n)²-(m+2n)²】² 当m=2,n=1时 的值简便点的,先化简 在求值
求(m-2n)²(m+2n)²-【(m-2n)²-(m+2n)²】² 当m=2,n=1时 的值
简便点的,先化简 在求值
求(m-2n)²(m+2n)²-【(m-2n)²-(m+2n)²】² 当m=2,n=1时 的值简便点的,先化简 在求值
原式=[(m-2n)(m+2n)]²-[(m-2n+m+2n)(m-2n-m-2n)]²
=(m²-4n²)²-(-4mn)²
=m⁴-8m²n²+16n⁴-16m²n²
=m⁴-24m²n²+16n⁴
=16-96+16
=-64