先化简,在求值.要把过程写清.3x²y²+2xy-7x²y²-2分之3xy+2+4x²y²,其中x=2,y=4分之1
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![先化简,在求值.要把过程写清.3x²y²+2xy-7x²y²-2分之3xy+2+4x²y²,其中x=2,y=4分之1](/uploads/image/z/5430933-45-3.jpg?t=%E5%85%88%E5%8C%96%E7%AE%80%2C%E5%9C%A8%E6%B1%82%E5%80%BC.%E8%A6%81%E6%8A%8A%E8%BF%87%E7%A8%8B%E5%86%99%E6%B8%85.3x%26%23178%3By%26%23178%3B%EF%BC%8B2xy%EF%BC%8D7x%26%23178%3By%26%23178%3B%EF%BC%8D2%E5%88%86%E4%B9%8B3xy%EF%BC%8B2%EF%BC%8B4x%26%23178%3By%26%23178%3B%2C%E5%85%B6%E4%B8%ADx%EF%BC%9D2%2Cy%EF%BC%9D4%E5%88%86%E4%B9%8B1)
先化简,在求值.要把过程写清.3x²y²+2xy-7x²y²-2分之3xy+2+4x²y²,其中x=2,y=4分之1
先化简,在求值.要把过程写清.
3x²y²+2xy-7x²y²-2分之3xy+2+4x²y²,其中x=2,y=4分之1
先化简,在求值.要把过程写清.3x²y²+2xy-7x²y²-2分之3xy+2+4x²y²,其中x=2,y=4分之1
3x²y²+2xy-7x²y²-2分之3xy+2+4x²y²,其中x=2,y=4分之1
=(3-7+4)x²y²+(2-3/2)xy+2
=xy/2+2
=2×(1/4)/2+2
=1/4+2
=9/4;
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