請問新pp的問題

[mht]

應該都是簡單的問題,還是想不出來,請較高手指點一下魯~感謝!
1. 是表格,我大致畫一下位置(不會畫線,即在+.x.y.z下方有一條橫線;在+ 4.e.f右方一條直線--類似方格圖囉)
+ x y z
4 1 -5 m
e 7 n 10
f 2 -4 5

求m+n=? (這題是完全不懂它們之間的關係 ) Ans. 5

2. Is isosceles 三角形RST what is the measure of 角 R?
(1)the measure of 角T=100度
(2)the measure of 角s=40度
Ans. A

3. How many hours did it taken Helento drive from her house to her parents' house?
(1)Helen's average speed on this trip was 72 kilometers per hour.
(2)If Helen average speed on this trip had been 8 kilometers per hour greater, it would have taken her 1 hour less.
<這個句子不大懂它的意思>
Ans. C

4.A basket contain 5 apples of which 1 is spoiled and the rest are good. If H is to select 2 apples from the basket simultaneously and at random, what is the probility that the 2 apples selected will include the spoild apple?
(不是1/5呀?不知機率算式分子為?) Ans. 2/5

[micki]

1. 是表格,我大致畫一下位置(不會畫線,即在+.x.y.z下方有一條橫線;在+ 4.e.f右方一條直線--類似方格圖囉)
+ x y z
4 1 -5 m
e 7 n 10
f 2 -4 5

求m+n=? (這題是完全不懂它們之間的關係 ) Ans. 5

x+4=1 => x=-3
y+4=-5=> y=-9
e+x=7 => e-3=7 => e=10
e+y=n => 10-9=1=n
e+z=10=> 10+z=10 => z=0
4+z=m => m=4

m+n= 4+1=5

[micki]

你可能要花點時間看一下置頂的規定.

一篇只能問一個問題...
這樣版主比較好整理....
請多配合

[mht]

嗯~不好意思..沒注意看說,下次會遵守的~
也謝謝你的回答喔