幾條百分數既問題!!急

(1)1. 9/10 2. 21/50 3. 5/8 4. 133/300
(2)1. 70% 2. 52% 3. 62.5@ 4. 211.11%
(3)1. 0.03 2. 0.228 3. 2.54 4. 0.0067
(4)1. 50% 2. 1% 3. 349% 4. 111.82%
(5)1. 65% 2. 106.25% 3. 43.9% 4. 0.12%

2008-09-02 18:39:39 補充：
(1)1. 9/10 2. 21/50 3. 5/8 4. 134/300

一.
a)45%
=45/100
=9/20

b)84%
=84/100
=21/25

c)62.5%
=62.5/100
=625/1000
=5/8

d)133又3分1%
=100% 33% 1/3%
=1 33/100 1/3÷100
=300/300 99/300 3/300
=402/300
=134/100

二.
a)7/10x100%
=7x10%
=70%

b)13/25x100%
=13x4%
=52%

c)5/8x100%
=5/2x25%
=125/2%
=62又2分1%

d)2又9分1x100%
=19/9x100%
=1900/9%
=211又9分1%

三.
a)3%
=3÷100
=0.03

b)22.8%
=22.8÷100
=0.228

c)254%
=254÷100
=2.54

d)0.67%
=0.67÷100
=0.0067

四.
a)0.5
=0.5x100%
=50%

b)0.01
=0.01x100%
=1%

c)3.49
=3.49x100%
=349%

d)1.1182
=1.1182x100%
=111.82%

五.
a)13/20
=13/20x100%
=13x5%
=65%

b)1又16分之1
=17/16x100%
=17/4x25%
=425/4%
=106又4分1%

c)0.439
=0.439x100%
=43.9%

d)0.0012
=0.0012x100%
=0.12%