脱式计算．
6450-2600÷650×278
（512+2688÷56）×73
（9640-5230）÷（38+25）
（1）6450-2600÷650×278
=6450-[4×（300-22）]，
=6450-[4×300-4×22]，
=6450-[1200-88]，
=6450-1112，
=5338；
（2）（512+2688÷56）×73
=（512+48）×73，
=560×（70+3），
=560×70+560×3，
=39200+1680，
=40880；
（3）（9640-5230）÷（38+25）
=4410÷63，
=70．
下面短文中共有8处语言错误，请在有错误的地方增加、删除或修改某个单词。 增加：在缺词处加一个漏字符号（∧），并在其下面写上该加的词。 删除：把多余的词用斜线（\）划掉。 修改：在错的词下划一横线，并在该词下面写上修改后的词。 注意：1. 每处错误及其修改均仅限一词； 2. 只允许修改8处，多者 (从第9处起) 不计分。
Last summer I take a part-time job in the International Camp for children. I have been told one more worker will be needed this year and I think you are fit it. How about join us? The camp is at the foot of a small hill close to a river. It is so a beautiful place! We can hear birds singing happy all around. Everybody sleeps in tents, which is very exciting. They usually work only five hour a day, so we will have plenty of spare time to visit the area and have a fun, I am sure it will be an unforgettable experience. If you are interested in it, reply to me soon. |
Luckily I was completely free then, so I’ll to say “yes”. I’ll arrive in Bristol at