5年级上册指导丛书55标准答案

同学们，你们好，今天我们一起来研究数学，巩固第五十五页的提高与创新。 你能填出字母所表示的数，使下面的等式成立吗？第一题， a 加 a 等于 a 乘 a， 两边我们都不能确定得数，所以我们可以先把 a 加 a 转化成 a 乘二，也可以写成二。 a 左右两边相等，左右两边都有一个 a， 我们可以把它抵消， 那剩余的这个 a 就和二相等了，所以 a 等于二，我们把二代入计算一下，二加二等于四，二乘二也等于四等式成立。那这里面还有没有特殊情况呢？对了，我们要把特殊的零考 进去，考虑进去。当 a 等于零时，零加零等于零，零乘零也等于零。所以这道题有两个答案，二或零。第二题， b 乘 b 等于 b 减 b， 左右两边相等，那哪边能先确定得数呢？我们不难发现， b 减 b 等于零，那 b 乘 b 也得等于零，两个一样的数相乘得零，你知道 b 等于几了吗？对了， b 等于零， 零乘零等于零，零减零也等于零。第三题， m 除以 m 等于 m 加 m， 哪边可以先确定得数呢？ m 除以 m 一定等于一，那么两个一样的数相加等于一， m 等于几呢？就是把一平均分成两份，所以 m 等于零点五， 零点五除以零点五等于一，零点五加零点五也等于一等式成立。最后一道题，你能自己分析一下吗？哪边可以先确定得数呢？ n 除以 n 等于一，两个一样的数相除等于一，那么 n 乘 n 也得等一， 两个一样的数相乘等于一，这个数是几呢？对了，这个数是一，你明白了吗？

第五十五页 story time 故事时间 there is a can beside the river he is sad。 那里有个罐头。 can 是罐头啊，既有能的意思，又罐头意思。在河的旁边，他很难过。 can 罐头说， can you help me i want to go home。 你能帮助我吗？我想回家。 bird 鸟说， sorry， i'm busy！ 抱歉，我很忙。 a naughty bear kicks the can。 一只调皮的熊踢了这个罐子。 bear 熊说， haha can 罐头说， oh no the can flies over rabbits and monkey。 这个罐头飞过了兔子和猴子。 can 罐头说， help！ 救命 monkey 猴子说， look at that poor can 看看那个可怜的罐头。 rabbit 兔子说， come on， we are late for school！ 快点，我们上学迟到了。 the can falls between two fish。 这罐头掉在了两条鱼的中间。 mister fish fish 先生说， here comes a can！ 这来了一个罐头。 miss fish 于夫人说， let's give it to zoom he can help。 让我们给 zoom 吧，他能帮忙。 zoom catches the can zoom 抓到了这个罐头。 zoom 说， let me help you！ 让我帮助你。光头说， carol 说， thank you home sweet home。 谢谢家，甜蜜的家。

there are so many pictures my father can draw very well what a nice photo that's my grandma's garden there are many pretty flowers in it what's in the room there is a table beside the bed your room is really nice thanks there is a big bed yes i like my bed there is a nice photo too wow you look cool thank you hey， my computer is here on the desk let's play clock photo plant water bottle bike this is my room there's a clock a there is a clock in my room there is a clock and a plant in my room there is a clock a plant and a photo in my room there is a water bottle in my room there is a water bottle and a flower in my room there is a water bottle a flower and a bike in my room i cannot wait i cannot wait my birthday is on monday i cannot wait i cannot wait it's going to be a fun day a i a rainy rainy rainbow rainbow paint paint wait wait a y a say say way way birthday birthday monday monday this is the living room wow there are so many pictures here yes， my father can draw very well there are so many plants here too they're my grandmother's plants my grandparents have a garden in front of their house there are lots of flowers in it cool in front of beside between behind above where is the ball it's in front of the dog there is a can beside the river he is sad can you help me i want to go home sorry， i'm busy a naughty bear kicks the can haha oh no the can flies over rabbit and monkey help look at that poor can come on we're made for school the cam falls between two fish here comes a can let's give it to zoom he can help zoom as the can let me help you thank you home sweet home a photo of me。

sorry i love you 俺家的贝儿 case 哈哈。 哦， love you ok welcome to you to you。 你看好。 yes thank you thank you。

c story time one there is a can beside the river he is sad can you help me i want to go home sorry i'm busy too a naughty bear kicks the can haha oh no three the can flies over rabbit and monkey help look at that poor can come on we're late for school four the can falls between two fish here comes a can let's give it to zoom he can help five zoom catches the can let me help you thank you home sweet home。

c story time， c story time there is a can beside the river he is sad there is a can beside the river he is sad。 河边有一个铁罐，他很忧伤。 can you help me i want to go home can you help me i want to go home。 你能帮助我吗？我想回家。 sorry， i'm busy sorry， i'm busy。 抱歉，我很忙。 a naughty bear kicks the can a night bear catch a cat。 一只顽皮的熊踢飞了这个铁罐。 haha， oh， no haha， oh， no！ haha， oh boo！ the can flies over rabbit and monkey the can flies over rabbit and monkey。 这个铁罐飞过了兔子和猴子的顶部。 help！ look at that poor cam！ help！ look at the poor cam！ 救命！看那个可怜的铁罐！ come on！ we're late for school！ come on， we're late for school！ 快点，我们上学要迟到了！ the can falls between two fish the can falls between two fish。 这个铁罐将落在两条鱼之间。 here comes a can here comes a can。 这来了 一个铁罐。 let's give it to zoom he can help let's give it to rome he can help。 我们把它给猪母吧，它能够帮忙。 zoom catches the can ron catches the can。 祖母捡起了这个铁罐。 let me help you let me help you。 我来帮你。 thank you home sweet home thank you home sweet home。 谢谢家，甜蜜的家。