—Are you going to but a new camera?
| —Are you going to but a new camera? —Yes. But there are so many cameras that I can’t decide______________. A. how to use B. where to sell C. which to buy |
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已知：a，b，c∈R+，求证：a+b+c≥ab+bc+ca．
1年前2个回答
你能帮帮他们吗
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