林泓儒的部落格

1.

A:x

B:1.25x*0.75=0.9375x

2.

A4=(a3-1)/3 => a3=5

A3=(a2-1)/3 => a2=16

A2=(a1-1)/3 =>a1=49

3.

(n-1)^3=(n^2-2n+1)(n-1)

N^3-3n^2+3n-1>75

N^3-3n^2+3n>76

設n=5

125-75+15=65

N=6

216-108+18=126

當n=5

64<75

N=6

125>75

4.

86-6+1=81

81/2=40.5

41

1~~41~~81

6~~46~~86

5.

X+y+z=180

X+y=z-20

2z=200

Z=100

X+y=80

X=60 y=20

X=20 y=60

6.

9-8=1

7.

A:x^2+10x/3+1

B:x^2+11x/3

設x=1

A:2+10/3=16/3                                                                                        

B:14/3

X=3

A:9+10+1=20

B:9+11=20

8.

y>z

9.

16 1 0 4 9

10.

n/3+4

(n+12)/3

11.

3/10*4/15*4/16=1/50

12.

P=a

N=0.8a

M=1.15*0.8a=0.92a

13.

7 49 343 2401 16807

14.

39*41/100

16/241=7%

15.

A

B 54/241=22.4%

  93/337=27.6%

  107/410=26.1%

C 410

16.

(107*46/100)/(107*16/100)=46/16

17.

M=6x+4

P=6y+5

20/6=3…..2

18.

6*8*5=240

8*12*2.5=240

9*11*2.4=237.6(X)

240

A 12+16=28 16+10=26 12+10=22

B 16+24=40

D 20+20=40

19.

X+y+z=225

100 25 100

20.

R1^2*pi=48

R2^2*pi=75

Sqrt(48)/sqrt(75)=4/5