This is the only way that I can think of _______ the problem
| This is the only way that I can think of _______ the problem of water waste in urban areas. |
| [ ] |
| A. settling B. to settle C. settle D. settled |
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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