问题 解答题

某检修站,甲小组乘一辆汽车,约定向东为正,从A地出发到收工时,行走记录为(单位:千米):+15,﹣2,+5,﹣1,+10,﹣3,﹣2,+12,+4,﹣5,+6.同时,乙小组也从A地出发,沿南北方向的公路检修线路,约定向北为正,行走记录为:﹣17,+9,﹣2,+8,+6,+9,﹣5,﹣1,+4,﹣7,﹣8.

(1)分别计算收工时,甲、乙两组各在A地的哪一边,分别距A地多远?

(2)若每千米汽车耗油a升,求出发到收工时两组各耗油多少升?

答案

解:(1)∵(+15)+(﹣2)+(+5)+(﹣1)+(+10)+(﹣3)+(﹣2)+(+12)+(+4)+(﹣5)+(+6)=39,

∴收工时,甲组在A地的东边,且距A地39千米.

∵(﹣17)+(+9)+(﹣2)+(+8)+(+6)+(+9)+(﹣5)+(﹣1)+(+4)+(﹣7)+(﹣8)=﹣4,

∴收工时,乙组在A地的南边,且距A地4千米;

(2)从出发到收工时,

甲组耗油为[|+15|+|﹣2|+|+5|+|﹣1|+|+10|+|﹣3|+|﹣2|+|+12|+|+4|+|﹣5|+|+6|]×a

=(15+2+5+1+10+3+2+12+4+5+6)×a

=65a升,

乙组耗油[|﹣17|+|+9|+|﹣2|+|+8|+|+6|+|+9|+|﹣5|+|﹣1|+|+4|+|﹣7|+|﹣8|]×a

=(17+9+2+8+6+9+5+1+4+7+8)×a

=76a升.

完形填空
完形填空。
     I think I've always been interested in food. My grandparents lived on a farm in Lincolnshire and had
a _  1    . She made fantastic English food; her roast beef was out of this world. I used to love going
down to the     2      and watching her work, and I learned a lot from her.  I realized that I wanted to be
a cook when I was about 12. When other boys      3     to do sports after school, I helped with cooking
at home. By the time I was 15, I had     4   _ to be a cook. However, I knew my parents wouldn't allow
me to be a cook.  I had to tell them about it     5     . I told them that I wanted to do a cookery course for
fun, and I stayed for a month in a hotel in Torguay.  I enjoyed it so much that I couldn't put off telling my
parents any longer,     6      I brought the subject up one night over dinner.     7      there was silence, and
then my father asked me why. I explained that cooking was     8      painting a picture or writing a book.  
Every meal was a work of creation.  I could see that my father disagreed, but he was not     9     . He just
looked at me and smiled. My mother kissed me.  And now I have my own restaurant, and it goes well. I
can see they are _ 10     me. However, my grandfather thinks I'm mad to give up farming.
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