—Excuse me, I wonder if you can help me.
| —Excuse me, I wonder if you can help me. —Sure. ________? |
| [ ] |
| A. What help B. What is this C. What is it D. What do you want |
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1年前1个回答
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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