解方程组｛①3x+6y=10②6x+3y=8 并求根号xy的值
人气：157 ℃ 时间：2019-11-07 21:27:55
解答
两式相加得：9x+9y=18,即x+y=2
两式相减得：-3x+3y=2,即x-y=-2/3
再相加得：x=2/3,
再相减得：y=4/3
因此√(xy)=2√2/3
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