推荐回答(5个)
盐与水
1、含盐5%的盐水中,盐和水的比是( )。
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3、在含盐率是15%的盐水中,加入3克盐17克水,这时的含盐率是( )%。
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4、盐占盐水的3/20,那么盐占水的( ),水占盐的( )。
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5、一种盐水的含盐率是15%,盐和水的比是( )。
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6、把20克盐放入200克水中,盐与水的比是( ),盐占盐水的质量比是( ),盐占盐水的( )%。
甲与已
1、甲比已数多1/4,已数比甲数少( )%。
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2、已数占甲数的3/5,两数的差是( ),和是( )。
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3、甲数是17.5,比已数的2倍少1.5,两数的和是( )。
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4、甲数比已数多1/4,甲数和已数的比是( ),甲数是已数的3/5,甲乙的比是( )。
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5、“甲数的20%是已数”是把( )当做单位一,“已数相当于甲数的15%”是把( )当做单位一。
6、甲比已多10%,已比甲少( )。
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7、甲、已两数的比是5:4,甲数是54,已数是( )。
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8、甲数是5,比已数少10%,乙数( )。
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9、甲数的2/3和已数的3/4相等,甲数比已数多( )%。
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综合题
1、某电视机一次降价10%,又降价10%后,现在的价格是原来的( )%
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2、小明读一本故事书,读了的页数是未读的40%,已知读了36页,全书共( )页。
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3、完成一项任务,计划5天完成,只用了4天,工作效率提高了( )
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4、工地上有5吨水泥,第一次用去50%,第二次用去1/5,还剩( )
5、一个数的1/5是1/6,这个数的1/2是( )
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6、把甲仓粮食的1/5调入已仓后,两仓存粮相等,原来已仓存粮是甲仓的( )
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7、食堂原来有大米80千克,吃去3/5后,在买进( )千克,食堂里的大米是原来的9/10.
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8、一袋大米,第一次用去40%,第二次用去总量的一半,两次共用去36千克,这袋大米原来重( )千克,还剩( )千克。
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9、一件商品原价100元,提价10%后,有降价10%,现价( )元
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横线上列竖式
累死我了,选我行不?
【题目】甲乙两人同时从一条800环形跑道同向行驶,甲100米/分,乙80米/分,两人每跑200米休息1分钟,甲需多久第一次追上乙?
【解答】这样的题有三种情况:在乙休息结束时被追上、在休息过程中被追上和在行进中被追上。很显然首先考虑在休息结束时的时间最少,如果不行再考虑在休息过程中被追上,最后考虑行进中被追上。其中在休息结束时或者休息过程中被追上的情况必须考虑是否是在休息点追上的。
由此首先考虑休息800÷200-1=3分钟的情况。甲就要比乙多休息3分钟,就相当于甲要追乙800+80×3=1040米,需要1040÷(100-80)=52分钟,52分钟甲行了52×100=5200米,刚好是在休息点追上的满足条件。行5200米要休息5200÷200-1=25分钟。
因此甲需要52+25=77分钟第一次追上乙。
1.一队人割草,有两个草地,小草地面积是大草地一半
全组人先用一上午的时间割大草地的草
下午,对半分开,一半人割大草地,一半人割小草地
傍晚,大草地被割完,小草地还要一个人一天才能割完
若上下午割草时间相同,那么这个割草队有几个人
答案:8人
2.学校组织下棋比赛,每两人赛一盘,胜得2分,平两人各得1分,负得0分
五位裁判记所有参赛人员总分为1979,1980,1981,1983,1984
那么谁计分正确? 这次比赛有多少人参加?
答案:45人参加,共计45*(45-1)=1980分
1、百货商场搞促销,满6000元打八五折。傅荫阿姨要买一台6600元的液晶电视,夏薇阿姨要为儿子买一台PSP游戏机1800元,现在她们打算合起来买,这样比单独买可节省多少元?
2、明明和亮亮的邮票的比是2∶5,亮亮有105张邮票,明明有几张邮票?
3、一张纸厚度约为0.11毫米,杭州市大约有700万人口,如果每人节约一张纸,叠起来有多少米?
水北村要挖一条800米的水渠,第一天挖了60%,第二天挖了8分之1两天共挖了多少米?
脱式计算
0.8×[7.9-(2+5)] 0.64×25×7.8+2.2
杰弗里斯123叔叔把2000元的稿费存入银行,存期为2年,年利率为2.70%,到期支取时,张叔叔要缴纳税后多少元的利息税?最后张叔叔能拿到多少钱?
(1)一个数的50%比32的60% 多75,这个数是多少?
(2)一个数比20的2%多7,这个数是多少?
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