出自GWD:
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%
解: 设1994年有 100人, 有电脑的有 40人
则1998年有 104人, 有电脑的有 401.3=52人
327. 一个三角形PQR, 问PRQR?
. PQ=QR ; .角PQR=60度
这道题我写JJ才发现自己错了,应该是C,
区别于316. DS:三角形PQR,问QRPR? A. QP=PR B.x不等于60度 Ans:E
328NEW!. 12!/2^x 是整数,问X最大是多少?应该是10
12!=24681012M=2 1+2+1+3+1+2N=2 10 N,所以X=10
329NEW!. 30个公司,有21个有NET INCOME,15个有INVESTMENT,问多少个公司既有NET INCOME,又有INVESTMENT.
.??个公司只有NET INCOME. ; .24个公司有 NET INCOME 或INVESTMENT,或BOTH. 答案:D
330. X不等于Y X+Y=XY?
. =1 ; . =X^2Y-XY^2 D
【09月数学试题讨论稿第十篇(306--340)】相关文章:
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