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【简答题】
已知函数f（x）=x 3 -2x 2 +ax+1（a∈R），若函数f（x）在区间（ 1 3 ，1）内是减函数，则a的取值范围是______．
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皮皮学刷刷变学霸
举一反三
【单选题】Listen to the dialogue and then choose the best answer. 1. What kind of account is the customer opening?
A.
A checking account.
B.
A savings account.
C.
It doesn’t say.
【简答题】A Bank Clerk and A Bank Customer Bank Clerk: Good morning, welcome to the Grammar Bank. How can I help you? Customer: Good morning. I would like to open a bank account. Bank Clerk: Sure thing. What ki...
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