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1、第 2 课时 百分数1填空。(1)三成五( )%( )折（ ） （ ）(2)一袋大米的 比它的 30%少 kg，这袋大米重( )kg。1 45 2(3)“实际超产 20%”这句话是把( )看作单位“1”。(4)男生人数是女生人数的 80%，那么女生人数是男生人数的( )%。(5)植一批树，成活 195 棵，死了 5 棵，成活率是( )%。2选择。(1)和 相等的数是( )。1 4A25% B二十五成 C2.5(2)一种冰箱按八折出售，是把( )看作单位“1”。A原来的价钱 B现在的价钱C降低的价钱(3)某种商品先打八折，再提价 20%，现价和原价相比( )。A提高了 B降低了 C不变(4)甲数
2、的 等于乙数的 60%(甲、乙两数都不为 0)，甲、乙两数相比( )。23A甲乙 B甲乙C甲乙 D无法确定3列式计算我最棒。(1)一个数的 20%比 100 少 25%，这个数是多少？(2)一个数的 80%比 22.4 少 4，这个数是多少？4用小麦种子做发芽实验，发芽 288 粒，12 粒没发芽，求发芽率。5一种商品，按八折出售，现在卖 64 元，原价是多少元？综合练综合练6一位汽车司机，改进汽车化油器以后，用 1 kg 汽油行驶的路程由原来的 36 km 增加到 43.2 km，增加了百分之几？7黑熊家的工厂最近业务量大增，黑熊经理决定拨一笔资金新雇一批工人。黑熊经理只想招一批熟练工或实习
3、工。已知一名熟练工比一名普通工每天能多生产 20%的产品，但熟练工需要的工资高些，用拨来的资金只能招 10 人。而一名实习工每天的生产量只能达到一名普通工的 80%，但用这批资金可以招 15 人。请你帮黑熊经理想想，怎样招工人才合算？参考答案参考答案1(1)35 三五 (2)50 (3)计划产量720(4)125 (5)97.52(1)A (2)A (3)B (4)B3(1)100(125%)20%375(2)(22.44)80%234288(28812)100%96%56480%80(元)6(43.236)3620%7提示：设一名普通工每天的生产量为 x，则 10 名熟练工一天的生产量为 x
4、(120%)1012x，而 15 名实习工一天的生产量为 x80%1512x，所以招熟练工和实习工增加的生产量是一样的。内部资料 仅供参考*Jg&6a*CZ7H$dq8KqqfHVZFedswSyXTy#&QA9wkxFyeQ!djs#XuyUP2kNXpRWXmA&UE9aQGn8xp$R#͑GxGjqv$UE9wEwZ#QcUE%&qYpEh5pDx2zVkum&gTXRm6X4NGpP$vSTT#&ksv*3tnGK8!z89AmYWpazadNu#KN&MuWFA5uxY7JnD6YWRrWwcvR9CpbK!zn%Mz849GxGjqv$UE9wEwZ#QcUE%&qYpEh
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