有一道数学题,麻烦哪位数学高手来帮帮忙吧!有三块草地,面积分别是5亩、15亩、24亩.草地上的草一样厚,而且长得一样快.第一块草地可供10头牛吃30天,第二块草地可供28头牛吃45天,问第三块草_作业帮
拍照搜题，秒出答案
有一道数学题,麻烦哪位数学高手来帮帮忙吧!有三块草地,面积分别是5亩、15亩、24亩.草地上的草一样厚,而且长得一样快.第一块草地可供10头牛吃30天,第二块草地可供28头牛吃45天,问第三块草
有一道数学题,麻烦哪位数学高手来帮帮忙吧!有三块草地,面积分别是5亩、15亩、24亩.草地上的草一样厚,而且长得一样快.第一块草地可供10头牛吃30天,第二块草地可供28头牛吃45天,问第三块草地可供多少头牛吃80天?
每头牛每天吃x,每亩每天生长速度为y,10*30*x = 5 + 30*5*y => 60*x = 1 + 30*y28*45*x = 15 + 45*15*y => 84*x = 1 + 45*yx = 1/12,y = 2/15第3块地z头牛吃80天z*80*x = 24 + 80*24*y => z = 42
这是牛吃草问题，答案是42头。
第三块草地可供42头牛吃80天图片最多上传9张
点击图片可以查看大
图呦，亲！2013 - 七杯橙汁 - 博客大巴
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访问统计：汽车功放改家用，用过很多电源都不行，把功放声音调大点就变红灯了，这是什么问题，求高手帮帮忙，低音炮_百度知道
汽车功放改家用，用过很多电源都不行，把功放声音调大点就变红灯了，这是什么问题，求高手帮帮忙，低音炮
低音炮200w，求高手帮帮忙，这是什么问题，把功放声音调大点就变红灯了，用过很多电源都不行汽车功放改家用
开关电源用的什么电源？从描述上看应该是电源功率不足？还是变压器
开关电源没有变压器的好，由于汽车音响它有局限性，不得不采用开关电源方式供电，所以就不难理解为什么家用功放都很重（里面有大环牛或大E牛变压器）。开大音量就严重失真不能正常播放显然是电源功率不足造成，懂音响的朋友都知从电源到功放再到喇叭的功率范围比例是
&1.5:1:1&左右。1.5表示电源功率，1表示功放块功率，最后的1表示喇叭功率（也就是输出负载）。如果你的功放是每个声道100瓦的，有4个声道，那就是100×4=400瓦，那么的电源功率应选择不小于500瓦的，600瓦也行，电源功率要有余量的，开大声音时才不会明显失真。有电子技术就弄个大环牛，降压滤波，会更好。没有技术只能用现成的开关电源了。选个功率足够的开关电源吧。
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