这是网友发布的一组百年老照片，据推测大概是20世纪初期，到川蜀游历的德国人所拍。这些老照片了保存了重庆、成都等地的珍贵历史画面。从中可以了解到清末社会生活的方方面面，图片为我们展现了当时纤夫、江上行船人家，和尚、道士、普通百姓的生活场景；还有一些如今已经不复存在的古迹古建筑，比如五福宫、万州古桥、长江栈道等，具有极大的史料价值。
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焦鲁亲4604在100张奖券中,有4张中奖,从中任取两张,两张都中奖的概率是多少? -
马飞克14777177114 ______ 两张都中奖的概率=C(4,2)/C(100,2)=4*3/100*99=1/25*33=1/825
焦鲁亲4604银行换的现金一百一张的一沓一般是多少钱? -
马飞克14777177114 ______ 银行一般一沓100的是一百张,那100张100元的那就是10000元. 望采纳.
焦鲁亲4604100张纸大约厚1厘米,照这样推算,10000000张这样的纸大约厚()米 -
马飞克14777177114 ______ 1000米 100张纸厚1厘米,那么10000000张就有100000厘米,100000厘米等于1000米
焦鲁亲4604某旅行社有100张床位,每床每晚收费20元时, -
马飞克14777177114 ______ 依题意,设每床每晚售出价增加2X元,即10+2X元, 则售出床位为100-10X张, 设当日收入为Y元,则有函数Y=(10+2X)*(100-10X) 即Y=-20(X*X-5X-50) Y=-20(X*X-2*2.5*X+2.5*2.5)+20*(50+2.5*2.5) Y=-20(X-2.5)*(X-2.5)+1125 所以当X=2.5,即售出价为5元时,函数Y由最大值1125, 售出床位75张,当日收入最大为1125元
焦鲁亲4604一根绳子长100米,第一次用了全长的四分之三,第二次用了剩下的五分之一,求绳长. -
马飞克14777177114 ______ 第一次用了:100*3/4=75(米) 第二次用了:(100-75)*1/5=5(米) 用了的长度:75+5=80(米) 剩余的长度:100-80=20(米)
焦鲁亲46044张一百3张十2张一块=几元 -
马飞克14777177114 ______ 解:4张一百3张十2张一块等于( 432 )元 ∵已知需求出4张一百3张十2张一块等于多少元 1张100元 = 100 * 1 = 100元 2张100元 = 100 + 100 = 100 * 2 = 200元 ∴4张100元 = 100 + 100 + 100 + 100 = 100 * 4 = 400元 ∵1张10元 = 10 * 1 = 10元 ...