首先把x代换成y﹍1+2x=3+y化为x=(2+y)/2,再把x代入5x=4y.得到关于y的方程,解出y=3/10,最后把y=3/10代入1+2x=3+y.x=3/8
1+2X=3+Y 5X=4Y的答案
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