28.12 9.2812 28.28fx=x12 x根9

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28.12 9.2812 28.28fx=x12 x根9
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28.12 9.2812 28.28fx=x12 x根9
28.12 9.2812 28.28fx=x12 x根9

28.12 9.2812 28.28fx=x12 x根9
x∈9正无穷t=x^28-28x 12-51ab≥-28a^28-28b^28