2002的正约数有______个．_爱下问搜题

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问题填空题

2002的正约数有______个．

答案

∵2002=2×7×11×13，

∴根据约数个数定理可得：

2002的正约数有（1+1）（1+1）（1+1）（1+1）=16．

故答案为：16．

填空题

Read and choose.（选择词语填空。注意英语句子的格式。）

what which when who why

1. — do you do at 8:00 in the morning every day?

— I do exercises.

2. — does your's brother like winter?

— Because he likes skating best.

3. — is playing football on the playground now?

— John with his friends .

4. — season do you like best?

— It's fall.

5. — is your father's birthday?

— It's in March.

填空题

关于x的一元二次方程(a-1)x²+x+a²-1=0有一个根是0，则a=（）。