搜狗做题网问一道数学题 已知xy=-2,x+y=3,求式子（3xy+10y+[+5x-(2xy+2y-3x)] 怎么写啊
![问一道数学题 已知xy=-2,x+y=3,求式子（3xy+10y+[+5x-(2xy+2y-3x)] 怎么写啊](/uploads/image/z/1354513-49-3.jpg?t=%E9%97%AE%E4%B8%80%E9%81%93%E6%95%B0%E5%AD%A6%E9%A2%98+%E5%B7%B2%E7%9F%A5xy%3D-2%2Cx%2By%3D3%2C%E6%B1%82%E5%BC%8F%E5%AD%90%EF%BC%883xy%2B10y%2B%5B%2B5x-%282xy%2B2y-3x%29%5D+%E6%80%8E%E4%B9%88%E5%86%99%E5%95%8A)
问一道数学题 已知xy=-2,x+y=3,求式子（3xy+10y+[+5x-(2xy+2y-3x)] 怎么写啊
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