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2023-08-28 13:57:09
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f(1) = 2(1)^3 + 5(1)^2 - 3(1) + 2
= 2 + 5 - 3 + 2
= 6
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2. ÒÑÖªÈý½ÇÐÎ ABC£¬ÆäÖÐ ¡ÏA = 50¡ã£¬¡ÏB = 70¡ã£¬Çó ¡ÏC µÄ¶ÈÊý¡£
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= 180¡ã - 50¡ã - 70¡ã
= 60¡ã
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1. ÖʵãÒÔ 5 m/s µÄËÙ¶ÈÔÈËÙÔ˶¯ 10 s£¬ÇóÖʵãµÄλÒÆ¡£
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λÒÆ = 5 m/s * 10 s
= 50 m
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2. Ò»¸öÎïÌå´Ó 3 m µÄ¸ß¶È×ÔÓÉÏÂÂ䣬ÇóËüÂäµØʱµÄËٶȡ£
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v = ¡Ì(2 * g * h)
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v = ¡Ì(2 * 9.8 m/s^2 * 3 m)
= ¡Ì(58.8 m^2/s^2)
= 7.67 m/s
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= 6 * 12 g/mol + 12 * 1 g/mol + 6 * 16 g/mol
= 72 g/mol + 12 g/mol + 96 g/mol
= 180 g/mol
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