Solve the following inequalities.
(a)a+2>3 (b)3x-4<5
--------------------------------------------------------------------------
10. A man is 14 years older than his son.Two years later, his age will be twice that of his son. Find the age of his son now.
12.Consider the sequence→ one over two,two over three,three over four,four over five......問題係下邊↓
(b)Express the n th term of the sequence in terms of n.
(c)Wthat is the 100th term?
7.Solve the following equations.
(a)2[3x(x-2)] = 3[2x(x-1)]+12
(b)2(x-2)-3(x+1)-5 = 3-5(x+1)
(c)3/2(x+1)-5/6 = 負1/3(-2) [Hint:Multiply both sides of the equation by 6.]
1.Write the algebraic expression 5/3既x-2in2 different word sentences.
2.The first term and the fifth term of a sequence are 1 and 16 respectively.Find the second, the third and the fourth terms of the sequence.
3.Find a function such that when the input x is -3.the out put y is 1/2.
maths!!求教(15點!!!!)
2010-08-27 9:19 pm
回答 (2)
2010-08-27 9:28 pm
✔ 最佳答案
1a)a+2>3
a>1
1b)
3x-4<5
3x<9
x<3
10) let the age of his son be x,
x+14+2=2(x+2)
x+16=2x+4
x=12
12b)
T(n) : n / (n+1)
12c)
T(100) : 100/101
7A)
2[3x(x-2)] = 3[2x(x-1)]+12
2(3x^2 - 6x) = 3(2x^2-2x)+12
6x^2-12x=6x^2-6x+12
6x= -12
x= -2
7B)
2(x-2)-3(x+1)-5 = 3-5(x+1)
2x-4-3x-3-5=3-5x-5
4x=10
x=2.5
7C)
3/2(x+1)-5/6 = -1/3(-2)
3(X+1)-5 = 2
3X+3=7
X=4/3
2010-08-27 13:29:33 補充：
Write the algebraic expression 5/3既x-2in2 different word sentences.
5 divided by 3 and multiply the difference of x and 2
2010-08-27 13:31:33 補充：
2.The first term and the fifth term of a sequence are 1 and 16 respectively.Find the second, the third and the fourth terms of the sequence.
the third term : 4
the second term : 2
the fourth term : 8
3.Find a function such that when the input x is -3.the out put y is 1/2.
x+7/2 = y
2010-08-27 9:37 pm
A+2>3者係A>1
3X-4<5
=3X<9
=X<3
10.THE AGE OF MAN(X) - THE AGE OF SON(Y) =14 ...(1)
THE AGE OF MAN +2 = (THE AGE OF SON+2)*2 ...(2)
FROM(1),
X=14+Y ...(3)
SUB (3) INTO (2)
14+Y+2 =(Y+2)*2
16+Y =2Y+4
Y=12
HENCE,THE AGE OF SON IS 12
12(B).
N/N+1
12(C)
SUB 100 INTO N/N+1,
THE 100TH TERM IS 100/101
3X-4<5
=3X<9
=X<3
10.THE AGE OF MAN(X) - THE AGE OF SON(Y) =14 ...(1)
THE AGE OF MAN +2 = (THE AGE OF SON+2)*2 ...(2)
FROM(1),
X=14+Y ...(3)
SUB (3) INTO (2)
14+Y+2 =(Y+2)*2
16+Y =2Y+4
Y=12
HENCE,THE AGE OF SON IS 12
12(B).
N/N+1
12(C)
SUB 100 INTO N/N+1,
THE 100TH TERM IS 100/101
收錄日期: 2021-04-16 01:05:48
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20100827000051KK00730