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f(x,y)=3(x+y)+32xy f(x,y)=3(x+y)-32xy f(x,y)=3(x+y)-16xy f(x,y)=3(x+y)+16xy
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f(x,y)=3(x+y)+32xy f(x,y)=3(x+y)-32xy f(x,y)=3(x+y)-16xy f(x,y)=3(x+y)+16xy
若x+y是偶数,则x与y不都是偶数 若x+y是偶数,则x与y都不是偶数 若x+y不是偶数,则x与y不都是偶数 若x+y不是偶数,则x与y都不是偶数
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