f1-f2 mathematics(MATHS){help+A+)

2007-07-22 2:02 am
[1]

Solve the following inequalites

(a) (b)

x+3>2 x-2<3

(c) (d)

2(X+1)>4 7x-9>9x+7





[2]

Consider the sequence

-3,9,-27

wriit down (a) the 5th term,....



(b) the general term ,hence the 100th tern

回答 (1)

2007-07-22 2:51 am
✔ 最佳答案
1.a
x+3>2
x>2-3
x>-1
1.b
x-2<3
x<3+2
x<5
1.c
2(X+1)>4
2X+2>4
2X>2
X>1
1.d
7x-9>9x+7
7x-9x>7+9
-2x>16
x<-8 [because -2(-8)=16 but -2(-9)>16 -8>-9]


2.
a: -3,9,-27,81, -243<--這是答案,因為這些數是由前一個數 乘-3 得來的
b: the 100th term: (-3)^100 =3^100
參考: me


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