对于任意有理数xy,定义一种新的运算,x*y=ax+by+cxy,又知道1*2=3,2*3=4,x*m=x,问m的值.对于任意有理数xy,定义一种新的运算,x*y=ax+by+cxy,其中abc代表已知数,等式左边是通常的加减乘运算,又知道1*2=3,2*3=4,
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