题目

尽量用简便的方法计算，书写计算过程①（4 +1.9﹣2.85）+（1.1﹣2.15）②10÷8+3.96×12.5%+2.04× ③32﹣0.8×（10.25+14.75）÷1.25． 答案：解：①（4 37 +1.9﹣2.85）+（1.1﹣2.15）=4 37 +1.9﹣2.85+1.1﹣2.15=4 37 +1.9+1.1﹣2.85﹣2.15=4 37 +（1.9+1.1）﹣（2.85+2.15）=4 37 +3﹣5=7 37 ﹣5=2 37 ；②10÷8+3.96×12.5%+2.04× 18=10× 18 +3.96×12.5%+2.04× 18=（10+3.96+2.04）× 18=16× 18=2；③32﹣0.8×（10.25+14.75）÷1.25=32﹣0.8×25÷1.25=32﹣20÷1.25=32﹣16=16．【1】Since nobody gave him any help, he ________have done the research on his own.【2】One of the few things you ________say about English people with certainty is that they talk a lot about the weather.【3】Some people who don’t like to talk much are not necessarily shy; they ________ just be quiet people.【4】When I was a child, I ________watch TV whenever I wanted to.【5】They ________ have arrived at lunchtime but their flight was delayed.【6】—In case anyone ________ come in my absence, tell him I will be back soon.—Sure, I will.【7】—Will the chairman come here by train?—He should, but he ________ not. He enjoys driving himself.【8】Parents are doing all they ________ to help their children achieve their ambitions.【9】—I have coffee to refresh myself recently.—Is that so? If you ________, make sure you limit it to one cup a day.【10】You are always throwing things about. How ________ I know where you’ve left your key?