问题
解答题
2□0×8,要使积的末尾有3个0,□里应填______.203×□,要使积的中间是0,□里可以填______.
答案
(1)250×8=2000;
所以2□0×8,要使积的末尾有3个0,□里应填5.
(2)203×1=203,
203×2=406,
203×3=609;
所以203×□,要使积的中间是0,□里可以填1或2或3.
故答案为:5,1或2或3.
2□0×8,要使积的末尾有3个0,□里应填______.203×□,要使积的中间是0,□里可以填______.
(1)250×8=2000;
所以2□0×8,要使积的末尾有3个0,□里应填5.
(2)203×1=203,
203×2=406,
203×3=609;
所以203×□,要使积的中间是0,□里可以填1或2或3.
故答案为:5,1或2或3.
Mr. Jackson works in a college. He likes reading and often 1 some books from the library. He keeps 2 to the radio every morning and reading 3 after dinner. So he knows much and teaches well. He is also good 4 his students. His students 5 him very much. Mike, Mr. Jackson's little son is only nine. He 6 likes reading books. And he often asks his father some questions. Mr. Jackson always thinks his son is too 7 to understand him, so he chooses(选择) 8 ones to answer. Of course the boy is not satisfied (对……满意) with them. One day Mike read something about the electric lights and was 9 them. When his father told him to do housework, he went on(继续)thinking 10 it. He asked him 11 questions, and his father answered all. Then his father said proudly(自豪地),“Fathers always know 12 than sons!” The boy thought for a while and said, “ 13 .” “Oh, why?” Mike didn't answer but asked. “ 14 invented(发明) the electric lights?” “Thomas Edison.” answered Mr. Jackson “Why didn't his father invent them then?” Mike asked again. Looking at his son, Mr. Jackson didn't know 15 to answer.
|