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数学
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已知|X|=2,|Y|=3,求3x+2y的值
人气:108 ℃ 时间:2020-02-03 14:42:36
解答
∵|X|=2,|Y|=3
∴X=±2,Y=±3
∴3x+2y=6+6=12或-6+6=0或6-6=0或-6-6=-12
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