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 a?b=a, then a?=
A. a2+ab B a2+ab+a C a2+a+b D a3+a2b E a3+a2b+a2
注:a2暗示a平方,a3暗示a立方
7新界说的运算a?b=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
谜底是D,问题问题我都看不懂,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。如不美观秘书总共打了10页,那么有若干好多封信是两页?
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
我感受这道题除了2不成能,其它四个数都有可能.可谜底是c,想问巨匠为什么?
问题问题意思是这5个数哪些可所以2个1的数的积,一个是奇数,一个是整数,只有6和14的因数中有奇数,所以C.
10 这是一道图表题.
what was the approximate percent increase in personal income from 1965 to 1970?
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