已知实数a,b,x,y满足ax+by=3,ay-bx=5,则(a²+b²)(x²+y²)的值为
人气:302 ℃ 时间:2019-09-01 10:52:29
解答
ax+by=3,ay-bx=5
平方相加
a²x²+b²y²+a²y²+b²x²=34
即 (a²+b²)(x²+y²)=34
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