灵活计算下面各题．（1）4.87×1.25×0.8（2）（5.6-5.6×0._爱下问搜题

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问题解答题

灵活计算下面各题．

（1）4.87×1.25×0.8	（2）（5.6-5.6×0.7）÷22.4
（3）3.7×9.9	（4）8.56×7.5+8.56×2.5．

答案

（1）4.87×1.25×0.8，

=4.87×（1.25×0.8），

=4.87×1，

=4.87；

（2）（5.6-5.6×0.7）÷22.4，

=（1-0.7）×5.6÷22.4，

=0.3×5.6÷22.4，

=1.68÷22.4，

=0.075；

（3）3.7×9.9，

=3.7×（10-0.1），

=3.7×10-3.7×0.1，

=37-0.37，

=36.63；

（4）8.56×7.5+8.56×2.5，

=8.56×（7.5+2.5），

=8.56×10，

=85.6．

完形填空

Michel is a young girl who works for the police     a handwriting expert (专家). She has helped      many criminals (罪犯) by using her special talents (天才).
When she was fourteen, Michel was already     interested in the differences in her friends'      that she would spend hours     them. After      college she went to France for a       two-year class in handwriting at the School of Police Science.
　　Michel says that it is     for people to hide their handwriting. She can        of what she needs to know simply      looking at the writing with her own eyes,    she also has machines     help her make     different kinds of paper and ink. This knowledge is often        great help to the police.
Michel believes that handwriting is a good    of what kind of person the      is. "I wouldn't go out with a fellow        I didn't like his handwriting.” She says. But she    she fell in love with her future husband, a young policeman        she studied his handwriting. It is later proved to be       , however.

D．handwriting

D．stepping into

A．with 　　　

A．so 　　　　

A．they 　　　

A．up 　　　　

A．of 　　　　

A．test 　　　

A．adds 　　　

A．before 　　

单项选择题

下列哪个选项不能提高程序的性能

A．不要在循环中创建和释放对象

B．在处理字符串时尽量使用StringBuffer类

C．避免太多的使用synchronized关键字

D．尽量在循环中创建对象