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1. 按照斐波那契数列的排列规律,填出后面几项的数。
3,5,8,13,21,$(\quad)$,$(\quad)$,$(\quad)$…
3,5,8,13,21,$(\quad)$,$(\quad)$,$(\quad)$…
答案
34 55 89
2. 有一对刚出生的小兔子,一个月后长成大兔子,再过一个月,这对兔子每个月又要生一对小兔子。在没有死亡的情况下,第八个月时总共有多少对兔子？
答案
根据题意可知，兔子繁殖规律符合斐波那契数列。$1+1+1+2+3+5+8=21$（对）
答：第八个月时总共有21对兔子。
答：第八个月时总共有21对兔子。
Ⅰ Read and write. 读一读,写一写。
Save and spend
Mum: Where are your old books?
Boy: They are in the box.
Mum: How many old toys do you have?
Boy: I have eighteen. One, two ... eighteen, nineteen, twenty books. One, two ... sixteen, seventeen, eighteen toys. I'll sell my things at the flea market.
New semester(新学期) is coming. I pay fifteen yuan for new pens and erasers. Five yuan for new rulers. I put my money back in my piggy bank.
1. —Where are the old books? —They are ____ the box.
2. —How many old toys do you have? —I have ____ toys.
3. —How much do you pay for the new school things? —I pay ____ yuan for new pens and erasers. And ____ yuan for new rulers.
Save and spend
Mum: Where are your old books?
Boy: They are in the box.
Mum: How many old toys do you have?
Boy: I have eighteen. One, two ... eighteen, nineteen, twenty books. One, two ... sixteen, seventeen, eighteen toys. I'll sell my things at the flea market.
New semester(新学期) is coming. I pay fifteen yuan for new pens and erasers. Five yuan for new rulers. I put my money back in my piggy bank.
1. —Where are the old books? —They are ____ the box.
2. —How many old toys do you have? —I have ____ toys.
3. —How much do you pay for the new school things? —I pay ____ yuan for new pens and erasers. And ____ yuan for new rulers.
答案
1. in 2. 18 / eighteen 3. 15 / fifteen 4. 5 / five
