1 / 2 / 3 of the size

1 / 2 / 3 of the size

1 / 2 big

2 and 1 / 3 and 3 and 1 / 2 are relatively large

Two and one-third
less than
Three and one in two

3:2:2:3:12.33:3:1

3 and 1 / 2 = 3.5
2 and 1 / 3 = 2.3333
two point three three
3 and 1 / 3 = 3.3333
two point three three

The ratio is 2 and 8 / 3 × 1 () 2 and 8 / 3, 7 and 8 / 7 × 8 and 7 / 3 () 8 and 7 / 3

Fill in the first =, fill in the second >,

Compare the size and important process (1) - 8 / 9, - 9 / 10 (2) - 0.618, - 3 / 5 (3) 0, | - 8 | (4) - 1 and 2 / 7, - 1 and 1 / 3

（1） ﹣8/9,﹣9/10
-8/9=-80/90; -9/10=-81/90
∵ 80/90-81/90
∴﹣8/9>﹣9/10
（2） ﹣0.618,﹣3/5
-3/5=-0.6 ,0.618>0.6
∴-0.6180
0-1 and 1 / 3

6,4,8/3,16/9,32/27,（）,（）

：6,4,8/3,16/9,32/27,（64/81）,（128/243）

1,5,4,10,7,15 (), () to find the law

10 20

Find the rules: 1 1 3 2_____ 3 7 _____ 9 5 1 2 4 5 7 ____ 10 ____
1 1 3 2 _____ 3 7 _____ 9 5
1 2 4 5 7 ____ 10 ____

The blanks are 5, 4, 8 and 11
In the first group, the odd number is the rule of 1,3,5,7,9; the even number is the rule of 1,2,3,4,5. From this, we can calculate that the fifth is 5 and the eighth is 4
The second group can be regarded as every two consecutive numbers as a group, and the first number of each group minus the second number of the previous group is equal to 2

1.4.7.10. What's the 100th?

1.4.7.10. What is the 100th
an=1+3*(n-1)
a100=1+3*99=298

Find the law: - 1,4, - 7,10 (), (), ()

-1,4,-7,10(-13 ),(16 ),( -19)
Jump to see - 1 to - 7, plus - 6
4 to 10, plus 6