omg,u opened 5-6 accounts at one time?

查一下你信用分数先

No, just do not active those that you do not need (this is in case you lost them, or someone stolen them).

yes, those not active ones will show up in your credit report. But if you cancel them, they will also show up. So why cancel? (since it is likely you will need them later).

Even though those cards havent been actived, they will show up in your credit report (as what 1976 has mentioned above). 

The credit card company approved and issued you the card.  It's now your turn to choose whether use/active it or not.  It will distress your credit report more or less if you have too many cards on hand.

如果你按时交帐单，你的信用分数will absolutely get improved.  Here are some other tips:

Tips for Improving Your Score

• Monitor your credit report and dispute errors. Errors in your report will usually translate into a low score.
• Pay your bills on time even if it means you can only pay the minimum amount due.
• Low balances are a positive factor in scoring models. Don't use all your available credit.
• New credit applications can detract from your score. Even an application for a department store card can lower your score. Multiple applications can have a devastating effect on your score, especially around the time you are shopping for major purchases like a car loan or mortgage.
• Old accounts (even those you haven't used for a long time) can help your score. Scoring models look at not just how to use credit today but also how long you have used credit.
• Consolidating balances or moving debt around may make for one easy payment, but this can have an adverse effect on your score. Shuffling of balances could be especially harmful to your score if you close established accounts and open new accounts to consolidate your debt.
• Ask your lender what scoring model it uses. With new scoring models like the credit bureaus' VantageScore, it is easy to get confused. A number score alone will not tell you where you stand.
• Know the going interest rates. Current rates for mortgages, car loans, and other consumer credit are published in daily newspapers or can be found online at such sites as www.bankrate.com. If you have a good credit score but are not offered a good interest rate, ask questions, negotiate, or shop elsewhere.