(PS) Total 100 students; 33 students speak Spanish ; 25 students speak English ; 22 students speak French ; 11 students speak both Spanish & English; 17 students both speak Spanish & French; 12 students both speak English & French; 9 students speak 3 languages. How many students did not speak 3 languages?
解：100-33-25-22+11+17+12-9=51
请问为什麽用公式:T=A+B+C-M-2P+N不对呀? 我一直用这个公式解体 晕了!
M代表属于两个集合的数,P代表属于三个集合的数,N代表不属于任何一个集合的数
今天就是让这道题给害了!栽了! 回来后打开电脑发现JJ里竟然有了,真TNN 天意!
其他一道JJ也没遇到.真是 希望越大 失望越大.
考前认为数学必须M50,咳!本来认为每道题都会算,结果遇到一道没算出来,后面的就乱了.
JJ真的很重要,如果晚考一天 结果可能就不同了,咳 命该如此,就要让考两次.
奉献JJ一道:计算:8^88/88^8.
稍后再补充,先歇会
AA:
9. The following appeared in the opinion column of a financial magazine.
“On average, middle-aged consumers devote 39 percent of their retail expenditure to department store products and services, while for younger consumers the average is only 25 percent. Since the number of middle-aged people will increase dramatically within the next decade, department stores can expect retail sales to increase significantly during that period. Furthermore, to take advantage of the trend, these stores should begin to replace some of those products intended to attract the younger consumer with products intended to attract the middle-aged consumer.”
AI:
68. “Since the physical work environment affects employee productivity and morale, the employees themselves should have the right to decide how their workplace is designed.”
68. “Since the physical work environment affects employee productivity and morale, the employees themselves should have the right to decide how their workplace is designed.”
想起一道 S (X^2-X-2)(Y^2-Y-2)=? 1) X=2; 2) 忘了 反正不对. 前面的式子=(X-2)(X-1) 所以答案是A
补充１:一个长方形的XX,周围一圈阴影,知道长和宽和阴影部分的宽,求阴影不分的面积.(本月好象有一道类似的圆行的那道)
补充２:以一个半圆的直径为边画一个直角三角形,顶点在圆弧上,半径为2,求三角形的面积. S=4
补充３：（ＤＳ）一个数列有５个数，问中数是否等于平均数？Ａ）５个数是连续的；Ｂ）中数是７ 我选的是Ｃ
补充4: 从港口到小岛路程400M,一艘轮船去的时候顺风时速350M/H,回来时逆风250M/H;问平均速度.
补充5:1/X+1/Y=1/Z,用X表示YZ
补充6:F(X)=X-1/X 问F(1/X)=?
RC:关于两栖动物在水下和陆地生存的解释,
第一段讲两栖动物有特殊的供氧系统保证它们在水下的生存;(有题关于这个系统)
第二段讲着个系统是如何运做的,然后讲到了皮肤的作用
第三段讲在陆地后 它们如何变换用肺呼吸供养而停止水下供氧系统的转化(有题)
细节题和高亮作用.文章很长 一屏多.其它记不清楚了.
补充完毕.准备3月2战!
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