1.Slove the following equations for x if m=9,n=2 and l=7
x+2x+3x+4x=m+l-3n
2x+mx=lx+8n
2.For each expression,each letter represents a distinct number from 0 to 9.
find the value of each of them
AA AB
x AB - BA
-------------- -------------
ABC BC
3.Calculaye
(-4)(-5)
(+7)(-6)
(-4)(+3)(-5)
(-2)(+3)(-4)
- 6
-----------
-18
(-15)(+4)
-----------------
(20)
問maths
2007-08-08 11:00 pm
回答 (2)
2007-08-10 12:52 am
✔ 最佳答案
1.Slove the following equations for x if m=9,n=2 and l=7x+2x+3x+4x=m+l-3n----(1)
2x+mx=lx+8n-----(2)
(1)->10x=m+l-3n, 代入m=9,n=2 and l=7
10x=16-6=10, so x=1
(2)-> 2x+mx=lx+8n ,代入m=9,n=2 and l=7
2x+9x=7x+16
4x=16, so x=4
2.第二條唔明問乜
3.3.Calculaye
(-4)(-5)=20
(+7)(-6)=-42
(-4)(+3)(-5)=60
(-2)(+3)(-4)=24
- 6
-----------=1/3
-18
(-15)(+4)
-----------------=-3
(20)
參考: me
2007-08-09 1:38 am
(1a) x + 2x + 3x + 4x = m + l - 3n
10x = 9 + 7 - 3(2)
10x = 10
x = 1
(1b) 2x + mx = lx + 8n
2x +9x = 7x +8(2)
4x = 16
x = 4
10x = 9 + 7 - 3(2)
10x = 10
x = 1
(1b) 2x + mx = lx + 8n
2x +9x = 7x +8(2)
4x = 16
x = 4
收錄日期: 2021-04-13 18:02:36
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