已知实数a、b、c,且b≠0.若实数x 1 、x 2 、y 1 、y 2 满足x 1 2 +ax 2 2 =b,x 2 y 1 -x 1 y 2 =a,x 1 y 1 +ax 2 y 2 =c,则y 1 2 +ay 2 2 的值为______.
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