1.The c------ in the desert can help people carry heavy thin
1.The c------ in the desert can help people carry heavy things.
2.T--- of tourists come to visit the Great Wall every day.
3.I read your article in the m-----------,ang it was pretty moving .
2.T--- of tourists come to visit the Great Wall every day.
3.I read your article in the m-----------,ang it was pretty moving .
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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