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Excellence 數學暑期作業答案 f2-f3 [複製鏈接]

飛龍在天

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	鬱悶 2012-9-29 17:20:21

簽到天數: 18 天

[LV.4]偶爾看看III

電梯直達

樓主

發表於 2012-8-29 18:37:18 |只看該作者 |倒序瀏覽簡繁

Cp1
part c(I)
1) T
2) T
3) F
4) T

(II)
1.△
2.V
3.V
4.△
5.△
6.△

(III)
1.)0.5KG  2.) 0.05 Cm  3. 5g
part d
1.
a1. 7800 a2 7800  a3 7820
b1.)35200 b2.)35000  b3.)35200
c1.746000 c2.)750000  c3.)746000

2.
a1.) 5 a2.) 4.6 a3.)4.6
b1.)20 b2.)20 b3.)19.6
c1.) 9 c2)9.2 c3.)9.2

3.)  318.6= 300  3.95=4.00

speed of the car
300÷ 4
= 75 km/h

4a.) 6500÷5+2000    4b.)  150x4
=3300                =600

5a) 33x5 =165 5b) 40x6 =240          5c)30x5=150

6a) 0.2 ÷2 =0.1  6b) 0.1÷8.4 x100%=1.19
(cor to 3 sig fig )

7a)
((75+0.5)x(60+0.5))-((75-0.5)x(60-0.5))÷2

=67.5

7b) 67.5÷(75x60) x100%
=1.5%

cp2
part c (II)
1.T
2.T
3.T
4.F
5.F
6.F
7.T
8.F

part (II) ps: x^2 = x既二次方  x^3= x既3次方

1a) x^3  1b) 5  1c.) 9
2a.) 2x^3  2b.)1  2c.) -8
3a.) x^3  3b.)0 3c.) 5

part(III)

1.)5+3x +7x^2-x^3
2.)-x^3 +7x^2 +3x+5

PART D

1a)7x-2  1b)5x-17  1c)3x-4  1d)-3x-1

2a) 3x^3 -5x^2 -6x-5
2b) 2x^3-3x^2+6x+7
2c)2x^3+4x^2-12x+19
2d)3x^3=17x^2-10x-1

3a) x^2+9x+20  3b)2x^2+15x-8
4.) x^2(2x+1)-3x(2x+1)+5(2+1)
= 2x^3+x^2-6x^2-3x+15
=2x^3-5x^2-3x+15

5) (x^2+3x-10)(2x+1)
  =x^2(2x+1)+3x(2x+1)-10(2x+1)
=2x^3+x^2+6x^2+3x-20x-10
=2x^3+7x^2-17x-10
6) 5識xd
7) 5識xd
8a) 2(2x+1)+2(x+5)
=4x+2+2x+10
=6x+12cm
8b.) (2x+1)(x+5)
=2x^2+11x+5
  8c) 2(7^2)+11(7)+5
=180 cm^2

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飛龍在天

TD-進階生

諸葛亮.道破

Rank: 5 Rank: 5

TA的每日心情

	鬱悶 2012-9-29 17:20:21

簽到天數: 18 天

[LV.4]偶爾看看III

沙發

發表於 2012-8-29 18:37:46 |只看該作者簡繁

cp3

part c (I)

1.T
2.F
3.F
4.F
5.F
6.T
7.T
8.F

(II)

idenity ge 有 :2,3,4
(III)

1.) -1(-m^2+n^2)
2.) -1(-m^2+16)
3.) x(x-4)+4
4.) y(y+6)+9

part d

1. LHS: 4x^2-8x-6x+10+9
   =4x^2-14x+19

  RHS : 4x^2-6x-6x+9+10-2x
   =4x^2-14x+19

LHS=RHS

2.) b=1 c=-1 a=22

3a)  a(b+c-6)
3b)  a-(a-9 )
3c )  8a(b—1)
3d)  (a-b)(h-k)

4a)  -1(-x^2+16x^2)
4b)  a^2+7b(2a+7b_
4c)  (p+2k)(a-4)
4d)  2(a^2-9)

5a) y^2-12(y+3)
5b) x(x-4)+100

6) 5識xd
7) 5識xd

part E

1.) 0

CP4

part c (I)

1.T
2.T
3.F
4.T
5.F
6.F
7.T
8.F

(II)

(因為唔知number of variables 係乜  so 冇做  整係做左subject )

1. y
2.v
3.A
4.p
5.S

(III)

1.) 385
2.)2870

part (D)

1a) y=2x3^2-5x3+12
      =18-5x3+12
=18-15+12
      Y=15

   1b) y=2(-2^2)-5(-2)+12
=-8+10+12
=14

   2) c=28+
c=44

3)


2v=48
v=24

4.)
=

=

5a)

=

5b)

=

6a) p=a+abt



6b) 18=



t=13

   7.)

Y(b-x)=b+x

Yb-yx=b+x

Yb-b=yx+x

b(y-1)=x(y+1)

8a)

c= 14.3

8b&c :  5識xd

Cp5
part c (I)

1.T
2.T
3.F
4.F
5.T
6.F
7.T
8.F
9.F
(II)
PS :R=rational num
I=irrational num

1.R
2.R
3.I
4.I
5.R

(III)

1.4
2.6
3.7
4.8
5.10
6.12

Part D 1
1a. 0.4
1b.0.3
1c. 5/13
1d. 3/2
1e.8
1f.30
1g.13
1h.9

part d 2

2a.129.90
2b 3.99
3a.6
3b.28
4. 5^2+x^2=13^2 (pyth thm)
      x^2=13^2-5^2
         x=12

12^2+(5+y)^2=20^2(pyth thm)
   (5+y)^2=256
      5+y=16
      y=11
5a. (5√3)^2+5^2=AC^2
      √40=AC

5b.  AC=√40
5^2+(5√3)^2=ac^2
         AC=√40
∴∠ADC=90度

6.let AB be the distance of the straight line between the park and her home
(340+180)^2+390=AB^2
         ab^2= 422500
            ab=650

The time she run from the park to home

650÷100=6.5mins

7.5^2+pt^2=8^2(pyht thm)
  25+pt^2=64
   pt^2=39
      pt=√39
   4.2^2+QR^2=8^2
      QR^2=46.36
         QR=√46,36

   √46.36-√39

   =0.564(cor to 3 sig fig )
8. 5識xd

E. 1(i).2.2361
  1(ii).3.3437
  1.(iii)4.0888
  1.(iv)4.5215
  1.(v)4.7547
  1.(vi)4.8758
  b.  5

CP6

PART C.(I)
1.T
2.F
3.F
4.T

(II)
1.more than 1 solutions
2.no solutions
3.only 1 solutions

Part D
1.(a)
(i) x=-3 y=-1
x=0 y=2
x=3 y=5

(ii)
  x=-3 y=-5
  x=0 y=1
  x=3 y=7

3.  2x-y=11----------------------(1)
3x+y=4----------------------(2)
y=4-3x------------------------(3)

sub(3)into(1)
2x-(4-3x)=11
2x-4+3x=11
      5x=11+4
      5x=15
      x=3

4.  (1)x2

2x-4y=22--------------------(1)
  -) 2x+3y=8---------------------(2)
------------------------------
      -7y=14
      y=-2-----------(3)

   sub(3)into(1)
   2x-4(-2)=22
      2x+8=22
         2x=14
            x=7

5.  2=2m+c------------(1)
-7=-m+c------------(2)
m=7+c-------------(3)

sub(3)into(1)
2=2(7+c)+c
2=14+c+c
-12=3c
c=-4

sub(4) into(2)
  -7=-m+(-4)
-7+4=-m
  -3=-m
m=3

6a. (1)x2

2x+4y=20----------------(1)
-) 2x-y=5-------------------(2)
------------------------------------
   5y=15
   y=3-------------------(3)

sub(3) into(1)

2x+4(3)=20
   x=4

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