试用配方法说明整式5x²+54\5-6x恒大于零

试用配方法说明整式5x²+54\5-6x恒大于零

5x²+54/5-6x
=5(x²+54/25-(6/5)x)
=5(x²-(6/5)x+(3/5)^2-(3/5)^2+54/25)
=5((x-3/5)^2-9/25+54/25)
=5(x-3/5)^2+45/5
=5(x-3/5)^2+9>=9>9
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