方程不对,应该是:
(10y + x) = 4(10x + y) + 3-------①
(10y + x) = 8(y + x) + 7----------②
化简得:
6y = 39x + 3---------①
2y = 7x + 7----------②
①式减去三倍的②式,
解得:x = 1;y = 7
方程不对,应该是:
(10y + x) = 4(10x + y) + 3-------①
(10y + x) = 8(y + x) + 7----------②
化简得:
6y = 39x + 3---------①
2y = 7x + 7----------②
①式减去三倍的②式,
解得:x = 1;y = 7