Ms.Smiths new weekly salary $260
5 x0.08=20,那x+20=270260
6. On a certain number live, if -7 is a distance of 4 from n and 7 is a distance of 18
from n then n=
A.25 B.11 C.3 D.-3 E-11
6应该是-11
7. For all real numbers a and b. if ab=a, then a=
A. a2+ab B a2+ab+a C a2+a+b D a3+a2b E a3+a2b+a2
注:a2表示a平方,a3表示a立方
7新定义的运算ab=a, 那a=a=a=aa+aaa+aab
8.secretary typed 6 letters,each of which had either 1 or 2 pages.If the secretary typed 10 pages in all, how many of the letters had 2 pages?
A 1 B 2 C 3 D 4 E 5
答案是D,题目我都看不懂,是啥意思呢?
这是说秘书打六封信,没一封信要1页或者两页。如果秘书总共打了10页,那么有多少封信是两页?
解答:设有x封,则2x+=10,解得x=4.
9 how many of the five numbers above are each equal to the product of an integer and an odd integer that GREater than 1?
这五个数是:2 6 8 14 16
a.none b.one c.two d.there e.four
我觉得这道题除了2不可能,其它四个数都有可能.可答案是c,想问大家为什么?
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