中一數學題(英文)好多唔識,,識ge幫下我..thz!!(15點)

2006-12-29 10:59 pm
1. subtract a from b, then multiply half of the ditterence by c' may be written as
A. b-2ac B. c- ac/2 C. a- bc/2 D. (a-b)c/2 E. (b-a)c/2
2.Simplify the following expressions:
a) 5a 2次方*(2a)3次方/10a 3次方
b) 4x 2次方*y/12x 3次方*y 4次方
c) (3pq 3次方)2次方(p 2次方q 3次方)

3. When the sum of 3 and three-quarters of the number is 21, find the number.

睇得明ge智商150
睇得明少少ge就120
睇唔明ge就110
我係睇唔明架..

回答 (2)

2006-12-29 11:39 pm
✔ 最佳答案
1. E (從B減去A,然後用一半的值去乘C) 即係(b-a)/2 x c = (b-a)c/2

2a. 5a2次 * (2a)3次 / 10a3次
=[5 * (2) 3次 * a2 次 * a3次] / (2 * 5) a3次
=(2)2次 * a2次
=(2a)2次方

2b. 4x 2次*y/12x 3次*y 4次
=1/3 * x(2-3)次 * y(1-4)次
= 1/3xy3次

2c. (3pq 3次)2次(p 2次q 3次)
= (3)2次 * p2次 * q (3*2)次 * p 2次q 3次
= (3)2次 * p(2+2)次 * q (6+3)次
= (3p2次)2次q9次

3. 3+ 3n/4 = 21
(3/4)n = 17
n = 68/3

4. A= 3M.....(1)
A+7 = 37.......(2)

From (2), A=30........(3)
Put (3) into (1), M=10

2006-12-29 15:43:11 補充:
第3條 three-quarters 即係解 3個四份之一 即係 四份之三第四條 A = Ann's age, M = Mary's age
2006-12-29 11:29 pm
1.b減a,then乘1半of c,所以個answer係c

2.你d字打到既近,無心情睇

3.如果3和一個數的3次方+在一個起,個answer就係21,找出個n.o

4.ann既old係mary既3倍,7年後,ann就37years old.在那時mary佢幾years old?
設mary現在幾years old 10+7
=17 所以那時mary佢17 years old
3x+7=37
3x=30
x=10

如果你改左第二題先左answer your question

好野!!!我ge智商150(雖然我知係假)
參考: 我d智商


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