✔ 最佳答案
王宅兩週共吃白米32公斤,若第二週比第一週少吃4公斤。王宅第一週吃去白米多少公斤?
設第一週吃去白米x公斤,第二週則是x-4公斤,
所以 x + x - 4 = 32
2x=36
x=18
第一週吃去白米18公斤
長方形的周界是48cm, 長是闊的2倍,求闊度。
設闊 = x cm, 長 = 2x cm
x + 2x + x + 2x = 48
6x = 48
x = 8
闊 = 8 cm
兩個連續數之和是39,求大數。
設大數為 x 。
x + x - 1 = 39
2x = 40
x = 20
大數 = 20
7y=91
y = 13
5y÷3+7=22
5y÷3=15
5y=45
y=9
2y+7=35
2y=28
y=14
y÷3-7=35
y÷3=42
y=126
8y=144
y=144/8=72/4=36/2=18
3y+5=38
3y=33
y=11
5y+210=960
5y=750
y=150
8y-24=120
8y=144
y=18
(y-10)÷12=11 <-- 修正
y-10=132
y=142
y÷4=150-112 <-- 修正
y÷4=38
y=152
2y-10=6
2y=16
y=8
3(y-4900)=4200
y-4900=1400
y=6300
7y-y=30
6y=30
y=5
7y+4=18
7y=14
y=2
y÷3-1=一又四分之一
y÷3-1 = 1+1/4
y÷3-1 = 5/4
y÷3 = 9/4
y=27/4
4y÷5=8
4y=40
y=10
2013-10-19 19:03:14 補充:
所以我唯一希望的係:佢只係想check 答案~
〔不願意去想更悲觀的事...〕
2013-10-19 19:43:14 補充:
我讀初中果陣全香港都未流行有電腦,有都唔係家家會上網~
而家係山卡啦地方都可以衞星上網啦~
〔X_X 我係度爆料?!?!〕
2013-10-19 20:38:51 補充:
什麼????
邏輯問題????
「我讀初中果陣全香港都未流行有電腦」似乎只可以代表 time < x
不能代表 time ≥ y ???
2013-10-19 20:45:16 補充:
No matter what the truth is, just speaking logically ^__^,
「當時未流行有電腦」, so that time < "some known time"
That time can be 1920, 1930, 1940, so you may draw possible conclusion that you are younger than me, if condition is satisfied.
2013-10-19 20:45:51 補充:
However, logically speaking (no matter it is true or not), you cannot be draw a conclusion that you are older than me, I guess.
(Recall that I am talking about the logic, not the fact.) =P
2013-10-19 21:01:19 補充:
nonono~
just practice logic~
^__^
2013-10-19 21:39:15 補充:
哈哈哈~
總之郭老師就係前輩啦~
^__^