题干

将如图沿线折成一个正立方体,把每个顶点相连的三个数字相加,求可得的最大值.

上一题 下一题 0.0难度 选择题 更新时间:2016-09-09 04:12:04

答案(点此获取答案解析)

解:根据分析,折后的立文体如图:

折成后的立方体的上面、前面和右面上的数字分别是5,3,6,它们的和最大.

同类题1

阅读下面的文字,完成1-4题。

民工父亲的“幸福”

李良旭

①刚刚搬入新居不久。这天,我面朝着宽大的落地玻璃窗,端坐在电脑前,专心打字。明媚的阳光像瀑布一样成桶地泼洒进来:温暖、清亮、宁静。心情,也沐浴在一片暖融融的气氛中。

②突然,大门响起一阵很不规则的敲门声。

③“你找谁?”我警惕地将门打开一条缝隙。

④“我是住在您这片小区里干活的民工,想请您帮个忙。”那个陌生人嗫嗫嚅嚅地说。

⑤“什么事?你说吧。”

⑥“快到暑假了,我儿子要到城里来看我,他很想知道自己的父亲在城里盖了多少漂亮的房子。房子是盖了许多,可我从不知道城里人住在里面的情况,我很难给孩子描述清楚。要是他来了,我能带他到您家看一看吗?”

⑦这位民工一口气把话说完后,他望着我,一脸的焦灼和企盼,两眼露出渴求的神情。

⑧我恍然大悟——真是一个心细、慈爱的父亲啊!我也是一个父亲,在工作中取得了一点成绩,或在报刊上发表了一篇小文章,不也是喜欢在儿子面前表现一番吗?那是一个做父亲的自豪和骄傲啊!想到这,我答应了。

⑨他激动得连手也不知道放在哪里好了,脸上现出喜悦的神色。他连声说道:“您真是大好人啊!我问了好几家,有的一句话也不说,随手就将门咣地关上了;有的还怀疑我是坏人,一直看着我走进了工棚……”

几天后,这位民工父亲果然带着一个小男孩来到我家。小男孩十三四岁,黝黑的皮肤,结实的身体,明亮的双眸。

 “换上吧。”我热情地说。父子俩换上了鞋套,像是生怕将木地板踏坏了似的,步子迈得格外轻缓,给人一种拘谨的感觉。我看到,一只大手和一只小手紧紧地握在一起。父亲对孩子说:“这位叔叔住的这套房子就是爸爸的建筑公司盖的。我负责砌墙,眼细、心细、手细,不能有丝毫的偏差……对了,爸爸也通过了中级工的考试。现在,我也是有文凭的建筑工人了。”

儿子听着,眼里流露着一种自豪和骄傲的神色。我又看到,一只小手和一只大手紧紧地握在一起,父亲的腰板似乎挺直了许多。在一旁的我,心里也有一种温暖和甜蜜的感觉。

一会儿,这对父子就看完了我的新居。退到门边时,这位民工父亲伸出手,重重地握住了我的手,感动地说道:“今天,是我进城打工以来过得最幸福的一天。我能带孩子到城里人家来看看,感受到了城里人家的温暖,这种幸福我一辈子也忘不了。”我看到这位民工父亲的眼里闪着晶莹的泪光。真没想到,在我看来一件简单、普通的事,竟让这位民工父亲这么激动,一下子,我也感动了,我和这位民工父亲的距离拉近了许多。我差一点把那位民工父亲的“幸福”弄成了碎片,一种隐痛扎着我的心。

父子俩互相搀扶着下楼,那孩子对他父亲说道:“爸爸,您真了不起,盖出这么好的房子,城里人住得真舒服。如果我们在城里也能住上这么漂亮的房子就好了。”儿子的语气里有一种羡慕和向往。父亲爱怜地摸了摸孩子的头,说道:“傻孩子,这怎么可能呢?你只要在家里把书念好,帮爷爷奶奶多干点活就行了。”

孩子仰起稚气的脸,眨着双眼,高声说道:“怎么不可能?我一定好好读书,将来有出息了,一定要让您和妈妈住上这么好的房子,过着城里人一样的生活。”

听了孩子的一番话,这位民工父亲将孩子往怀里搂了搂

我看到,这位民工父亲的腰杆努力地挺了挺。

顿时,他在我眼里一下子变得高大起来——一个父亲的伟岸和善良!

同类题2

通读下面短文,掌握其大意,然后在各题所给的四个选项中选出一个最佳答案。

    Growing up is not always easy. When facing difficulties, courage and a spirit of independence (独立)can be more useful than crying for help. That's what's the story I've heard recently tells me.

    The young man was born in 1982 in a 1 family in a small town .When he was only 11, his father became mentally ill and one day came back with an abandoned baby (弃儿) girl. A year later, his 2 left home with his younger brother because she couldn't  3 hard life and pressure from her mad husband. The 12-year-old boy began to 4 his whole family: he took care of not only his sic k father, but also the little girl. 5, he didn't give up studying. Later he went to college. To care for the little girl, he rented a room near his college and 6 her education by doing part-time jobs.

    After the young man's story went public, people were deeply impressed by his behavior.

7 his life was hard, he didn't abandon his father and his sister because 8 needed his help very much. And he 9 donations from others. He said he felt 10 because of kind offers, but he could depend on his own work. With his hard –won money, he 11 helped other students in trouble .

    Today when many young people worry more about their own happiness, this young man's behavior reminds us of what we don't usually 12: love and care for others. Nobody could continue to live 13 these.

    Through his hard life, the young man is regarded as a 14. So when facing difficulties, don't 15 bad luck. Consider what more you could do for your family and society, and you'll find the world smiling back.