A:paid; appearing
B:taken; reached
C:centered; arriving at
D:given; driving
a1+a22≥a1a2a1+a2+a33≥a1a2a33a1+a2+a3+a44≥a1a2a3a44⋯⋯⋯
照此规律,当 n∈N+(n≥2) 时, a1+a2+a3+⋯+ann≥ ____.
方程x2﹣3x﹣4=0的两根之和为( )
给下列句子选择合适的答语。
① How do you like this chess? ____ A. It's$50.
② How much is this sweater?____ B. Yes How much is it?
③ The socks are $50. ____ C. It's very pretty.
④ Can l help you? ____ D. They're too expensive.