第1个回答 2008-11-13
1, =20*4/3=80:3
2, =21*7/3=49:1
3, =40*10/3=400:3
4, =3/4 * 5/6=5:8
5, =1/2 *1000 /20=50/2=25:1
6, =1/4 * 60 /15=1:1
7, =1/10 * 100 /1=10:1
8, =1/8 *1000 /250=1:2
9, =1/20 * 4=1:5
10, =1.2/0.12=10:1(直接用计算器算,或者看小数位数,答案一目了然)
11, =4/5 * 10=8:1本回答被提问者采纳