中一數學,,3條,,急

equation是吧
1.Let x be the no.
6+6x= 6* (6兩次方[squre]) (唔識打)
6+6x=36
6x=36-6
x = 30/6
x = 5(underline間線)
Ans: The number is 6.

2.Let x be the larger number.
Then (x-10) will be the smaller number.
4(x-10)+ 1/3x = 25
4x-40+1/3x = 25
4&1/3x = 65
13/3x= 65
x= 65* 3/13
x= 5*3
x = 15(underline間線)
The small number : x-10
=15-10
= 5(underline間線)

Ans: The larger no.is 15 and the smaller no. is 5.



3呢題我唔知用唔用equation好.因為用左會好煩
我就咁做

(28-18)*1/4+28
=20*3/4+28
=15+28
=43
＝

Ans: Dick is 43 years old.

2007-10-04 20:03:03 補充：
第3條係underline 唔記得打重有睇翻上面d回答－　－先知香港人數學咁屎- -

2007-10-04 20:04:29 補充：
第3條個First step係*3/4即係(28-18)*3/4 28

2007-10-04 20:07:58 補充：
第3條睇錯左(計錯同埋睇錯*改翻重新做一次比你睇(28-18)/1/4 28

2007-10-04 20:10:35 補充：
(28-18)*4 28=40 28=68Ans.dick is 68 years old乘4哥到可能難明D佢係4份1所以要除4份1即係乘4

1 sorry i don't know

2. let the smallest number be y and the larger number be x
x-y=10------------------(1)
1/3x+4y=25-----------(2)
from (1) x=10+y-------(3)
sub (3)into (2)
1/3(10+y)+4y=25
10+y+12y=75
13y=65
y=5
sub y=5 into(3)
x=10+5
=15
the two number is 15 and 5

3.let sophia be a ,dick be b,gary be c ,maria be d
a=b+28-------------(1)
a=4c-----------------(2)
d=c+18-------------(3)
sub d=28 into (3)
28=c+18
c=10
sub c=10 into (2)
a=4(10)
=40
sub a=40 into (1)
40=b+28
b=68
dick is 68 years old

希望幫到你

你條有仔~
係咪讀丘中!!!!!!!!!!!!!!!!!!!!!

Q3)
Dick - 28 = Sophia; Sophia/4 = Gary; 18 + Gary = Maria
Now Maria = 28, then
Gary = 28 - 18 = 10
Sophia = 4 x Gary = 40
Dick = Sophia + 28 = 68

Q2)
Let the larger number is A and smaller number is B.
Now, A - B = 10; so A = 10 + B
4 x B + A/3 = 25
==> 4B + (10+B)/3 = 25
==> (12B + 10 + B) /3 = 25
==> 13B + 10 = 75
==> 13B = 65
==> B = 5
so, A = 10 + B ==> 15

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