若m-n=4,mn=-1,求(-2mn+2m+3n)-(3mn+2n-2m)-(m+4n+mn)的值谁帮我坐下,
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![若m-n=4,mn=-1,求(-2mn+2m+3n)-(3mn+2n-2m)-(m+4n+mn)的值谁帮我坐下,](/uploads/image/z/646371-27-1.jpg?t=%E8%8B%A5m-n%3D4%2Cmn%3D-1%2C%E6%B1%82%EF%BC%88-2mn%2B2m%2B3n%EF%BC%89-%EF%BC%883mn%2B2n-2m%EF%BC%89-%EF%BC%88m%2B4n%2Bmn%EF%BC%89%E7%9A%84%E5%80%BC%E8%B0%81%E5%B8%AE%E6%88%91%E5%9D%90%E4%B8%8B%2C)
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若m-n=4,mn=-1,求(-2mn+2m+3n)-(3mn+2n-2m)-(m+4n+mn)的值谁帮我坐下,
若m-n=4,mn=-1,求(-2mn+2m+3n)-(3mn+2n-2m)-(m+4n+mn)的值
谁帮我坐下,
若m-n=4,mn=-1,求(-2mn+2m+3n)-(3mn+2n-2m)-(m+4n+mn)的值谁帮我坐下,
(-2mn+2m+3n)-(3mn+2n-2m)-(m+4n+mn)
=-2mn+2m+3n-3mn-2n+2m-m-4n-mn
=(-2mn-3mn-mn)+(2m+2m-m)+(3n-2n-4n)
=-6mn+3m-3n
=-6mn+3(m-n)
将m-n=4,mn=-1代入
=-6mn+3(m-n)
=-6×(-1)+3×4
=-6+7
=1
(-2mn+2m+3n)-(3mn+2n-2m)-(m+4n+mn)
=-2mn+2m+3n-3mn-2n+2m-m-4n-mn
=-6mn+3m-3n=-6*(-1)+3(4)=6+12=18
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