Question

找规律，写数字

1. four,____,twelve_____,_____
2. three,six._____,twelve,______,______
3. ten,twelve,_____,____,______,twenty
4. one,three,six,____,_____,twenty-one
请说明为什么

Answer 1

1. four, eight ,twelve sixteen,twenty 4 8 12 16 20
2. three,six.nine,twelve,fifteen,eighteen 3 6 9 12 15 18
3. ten,twelve,fourteen,sixteen,eighteen,twenty 10 12 14 16 18 20
4. one,three,six,ten,fifteen,twenty-one 1 3 6 10 15 21

Answer 2

1. four,eight,twelve，sixteen,twenty
2. three,six.nine,twelve,fifteen,eighteen
3. ten,twelve,fourteen,sixteen,eighteen,twenty
4. one,three,six,ten,fifteen,twenty-one

Answer 3

1.eight sixteen twenty
2.nine fifteen eighteen
3.forteen sixteen eighteen
4.ten fifteen