∵x2+9y2-6xy=(x-3y)2≥0,
∴x2+9y2≥6xy.
若x,y为任意有理数,比较6xy与x2+9y2的大小.
若x,y为任意有理数,比较6xy与x2+9y2的大小.
数学人气:620 ℃时间:2019-11-07 18:01:18
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