18.解:6ec8aac122bd4f6e,解得6ec8aac122bd4f6e=5,d=3 ∴6ec8aac122bd4f6e=3n+2,6ec8aac122bd4f6e6ec8aac122bd4f6e=3×6ec8aac122bd4f6e+2,

  • 答案
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