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某天早 https:/img.zuoyebang.cc/zyb_8cea8f9e1e44fee4a53b84b1b8d04a09.jpg.9 点至晚 https
两简谐振动的振动方程分别为_(1)=3cos (2pi t-dfrac (pi )(3)), _(2)=4cos (2pi t+dfrac (pi )(6))单
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直线https:/img.zuoyebang.cc/zyb_3b22ae73d69b101d1bae06f562ca4bd9.jpg:dfrac (x+2)(3
【 https:/img.zuoyebang.cc/zyb_a2c4b8a86ffc9c17b4192162142e659f.jpg-3 .已知一质点的运动方程
两分振动方程分别为_(1)=3cos (50pi t+0.25pi )cm 和 _(2)=4cos (50pi t+0.75pi )cm则它们合振动的表达式为（
(13)(2010年,一)设总体X的分布为:-|||-X 1 2 3-|||-p https:/img.zuoyebang.cc/zyb_2a76612f050
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