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如果xny4与2xym相乘的结果是2x5y7,那么mn=   .

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如果 x=y,那么 x﹣2=y﹣2   如果﹣x=8,那么 x=﹣4  如果 mx=my,那么 x=y   如果|x|=|y|,那么 x=y  
8,2,3,4,5,6,7,1,  5,6,7,8,1,2,3,4,  1,2,3,4,5,6,7,8,  8,7,6,5,4,3,2,1  
8,2,3,4,5,6,7,1,  5,6,7,8,1,2,3,4,  1,2,3,4,5,6,7,8,  8,7,6,5,4,3,2,1,  
8,2,3,4,5,6,7,1  5,6,7,8,1,2,3,4  1,2,3,4,5,6,7,8  8,7,6,5,4,3,2,1  
(x-5y+1)(x-5y-8)   (x-5y+4)(x-5y-2)   (x-5y-4)(x-5y-2)   (x-5y-4)(x-5y+2)  
8,2,3,4,5,6,7,1,  5,6,7,8,1,2,3,4,  1,2,3,4,5,6,7,8,  8,7,6,5,4,3,2,1,  
4, 3, 7  3, 4, 7  5, 2, 7  2, 5, 7  
如果2x=2y+1,那么x=y+1  如果2=5+3x,那么3x=5﹣2   如果x﹣3=y﹣3,那么x=y  如果﹣8x=4,那么x=﹣2  
8,2,3,4,5,6,7,1,  5,6,7,8,1,2,3,4,  1,2,3,4,5,6,7,8,  8,7,6,5,4,3,2,1,  
8,2,3,4,5,6,7,1  5,6,7,8,1,2,3,4  1,2,3,4,5,6,7,8  8,7,6,5,4,3,2,1  

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