问题
选择题
下列计算正确的是（ ）
|
答案
A、x2•x3=x5，错误；
B、（2a3）2=4a6，正确；
C、（a-1）2=a2+1-2a，错误；
D、
=2，错误；4
故选B．
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下列计算正确的是（ ）
|
A、x2•x3=x5，错误；
B、（2a3）2=4a6，正确；
C、（a-1）2=a2+1-2a，错误；
D、
=2，错误；4
故选B．
| 完形填空。 | ||||
| Henry was not 1 at math. Even when the teacher explained something a second time, he still couldn't 2 it. "Never mind. I'll sit 3 the boy who's the best at 4 , " Henry thought, "and 5 his answers." The day of the exam 6 , and Henry sat next to Allan, 7 was 8 at the top of the class in math. Henry copied Allan's answers 9 his own exam paper. At the end of the exam, the teacher said, "Well, boys and girls, I've decided to give a red 10 to the student who got the 11 grade. It's 12 for me to decide who I'll give the star to, however, 13 two students, Henry and Allan, got the 14 grade." After a moment she went on, " 15 I've decided to give the star to 16 this time." Henry was 17 when he heard this. He stood 18 and said, "But I got the same grade as Allan, madam." "That's 19 ." The teacher said. "However, Allan's answer to Question 6 was 'I don't know.', but 20 was 'Nor do I.'" | ||||
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