化简并求值:2m-{n+[4n-3(m+2n)+6m]-5n},其中m=2/3,n=4
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化简并求值:2m-{n+[4n-3(m+2n)+6m]-5n},其中m=2/3,n=4
![化简并求值:2m-{n+[4n-3(m+2n)+6m]-5n},其中m=2/3,n=4](/uploads/image/z/17960224-40-4.jpg?t=%E5%8C%96%E7%AE%80%E5%B9%B6%E6%B1%82%E5%80%BC%EF%BC%9A2m%EF%BC%8D%7Bn%EF%BC%8B%5B4n%EF%BC%8D3%28m%EF%BC%8B2n%29%EF%BC%8B6m%5D%EF%BC%8D5n%7D%2C%E5%85%B6%E4%B8%ADm%3D2%2F3%2Cn%3D4)
2m-{n+[4n-3(m+2n)+6m]-5n}
=2m-{n+[4n-3m-6n+6m]-5n}
=2m-{n+3m-2n-5n}
=2m-{3m-6n}
=2m-3m+6n
=-m+6n
=-2/3+6*4
=23又1/3
=2m-{n+[4n-3m-6n+6m]-5n}
=2m-{n+3m-2n-5n}
=2m-{3m-6n}
=2m-3m+6n
=-m+6n
=-2/3+6*4
=23又1/3
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