279发行10种不同的邮票,某人有其中的3种。现从这10种中任选2种,问neither of the 2 stamps不在某人所有的3种之内的可能性 ? 答案:C/C=7/15
280. is x^2Y^2?
x0。 答案:E
281、=210^t,要求用k、m表示t 答案:k+m+1
=210^t, 10K+M+1=10T
282、直线l,y轴截距2,x轴截距-3,问与l平行的直线 ? 答案:3y-2x=0 同254
283、GWD那道拥有计算机的家庭比例题,答案50%
同304题
感谢ESeraph的补充:
Of the families in City X in 1994, 40 percent owned a personal computer. The number of families in City X owning
a computer in 1998 was 30 percent greater than it was in 1994, and the total number of families in
City X was 4 percent greater in 1998 than it was in 1994. What percent of the families in City X owned a personal computer in 1998?
A. 50%
B. 52%
C. 56%
D. 70%
E. 74%
284、从6个人中挑3个人组成committee,问有多少种可能? 答案:C=20
285、f=x-1/x,问下面哪一个等于f? 答案:f
同225 第2次出现
286、一个集合由44到54的连续整数 第组成,问随机挑出一个数字,能被7整除的概率 答案:只有49可以被7整除,所以P=1/11
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