0710G模考第一期~9504（题目讨论请勿占楼）

hanrui_542UID：2244376

谢谢Demo，还有小Q，有点感觉了，这小破题别看小真晦涩，ETS味就是浓

ZeratelUID：2262286

原帖由 purple7sky 于 2007-10-8 22:29 发表
18. Three solid cubes of lead, each with edges 10
centimeters long, are melted together in a level,
rectangular-shaped pan. The base of the pan has inside
dimensions of 20 centimeters by 30 ...

３个铅立方体，每个边长１０厘米．融在一个矩型平底锅里．锅的内部尺寸是２０Ｘ３０Ｘ１５．问这些熔的铅能达到多少高度．

解：３Ｘ１０Ｘ１０Ｘ１０＝３０００
　　３０００／２０／３０＝５
所以答案是５厘米

[ 本帖最后由 Zeratel 于 2007-10-9 00:02 编辑 ]

tytjackieUID：2292325

Section 3
24. The electricity used by the water heater was
measured separately and its cost per kilowatt-hour was
one-half the cost per kilowatt-hour of the rest of the
electricity used. The cost of the electricity used by the
water heater was most nearly what fraction of the total
cost of all the electricity used?
(A) 1/11
(B) 1/9
(C) 1/8
(D) 1/5
(E) It cannot be determined from the information
     given.

是个图表题，这道题怎么也没作出答案，求救～

okusaUID：2342264

设water heater 就是20，算式为 20/20+9X2+18X2+53X2 = 1/9

原帖由 tytjackie 于 2007-10-9 00:44 发表
Section 3
24. The electricity used by the water heater was
measured separately and its cost per kilowatt-hour was
one-half the cost per kilowatt-hour of the rest of the
electricity used. The ...

okusaUID：2342264

w,x,y,z are consecutive positive integers, and w<x<y<z.
15.The remainder when (w+x)(x+y)(y+z) is divided by 2 与 1

没有理解呀，有什么巧办法呢？谢谢

[ 本帖最后由 okusa 于 2007-10-9 01:25 编辑 ]

ZeratelUID：2262286

我当初就是设其中一个为A然后就算了...

ranranlanxinUID：2256716

谢谢版主

okusaUID：2342264

But i am sorry; still confused :(
could you...?

Divided by 2以后是什么呢？怎么和1比较咧？
大小题不应该呀，我一定是有重大的地方搞不清咧。三克丝

原帖由 Zeratel 于 2007-10-9 07:28 发表
我当初就是设其中一个为A然后就算了...

okusaUID：2342264

如38楼

hanrui_542UID：2244376

w,x,y,z are consecutive positive integers, and w<x<y<z.
15.The remainder when (w+x)(x+y)(y+z) is divided by 2 与 1
这道是考整数和奇偶数的概念，连续整数肯定是奇偶或偶奇交错，奇数+偶数肯定是奇数，三个奇数相乘还是奇数，不可能是偶数，奇数除2余1了。

Section 3
24. The electricity used by the water heater was
measured separately and its cost per kilowatt-hour was
one-half the cost per kilowatt-hour of the rest of the
electricity used. The cost of the electricity used by the
water heater was most nearly what fraction of the total
cost of all the electricity used?
(A) 1/11
(B) 1/9
(C) 1/8
(D) 1/5
(E) It cannot be determined from the information
     given.
这个one-half是什么，不是1.5吗

[ 本帖最后由 hanrui_542 于 2007-10-9 17:43 编辑 ]

leogUID：2280096

是1.5吧。这个我也很迷惑，算出来3/11，最接近的应该是D啊:confused:  谁来解惑？？

orange8UID：209742

1.5 = one and a half`````

DemoUID：2331967

原帖由 hanrui_542 于 2007-10-9 17:37 发表
这个one-half是什么，不是1.5吗

1/2

DemoUID：2331967

原帖由 hanrui_542 于 2007-10-9 17:37 发表
Section 3
24. The electricity used by the water heater was
measured separately and its cost per kilowatt-hour was
one-half the cost per kilowatt-hour of the rest of the
electricity used. The cost of the electricity used by the
water heater was most nearly what fraction of the total
cost of all the electricity used?
(A) 1/11
(B) 1/9
(C) 1/8
(D) 1/5
(E) It cannot be determined from the information
     given.

答案错了? 我觉得应该选E
没有告知使用时间 光给出功率是算不出总的用电量的..

ZeratelUID：2262286

应该是B吧..
因为求的是比例,所以:设WATER HEATER A元一度
加热器:800X0.2XA
其他:800X0.8X2A
总: 1440A
所以加热器占160A/1440A=1/9