若方程组和方程组有相同的解,求a,b的值.

若方程组和方程组有相同的解,求ab的值.

答案

解:因为两个方程组同解,所以解必然适合每个方程,方程组可以重新配组,得,解方程组,得,把代入方程组中,得,解这个方程组,得

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