UL 181A-P/B-FX listed and printed aluminum foil tape Linered Airtight performance on rigid fiberglass ductboard and flexible air duct Flexible and easy to use Superior stability during extreme fluctuations in temperature Specifications Learn more about AF 099 in depth by exploring all of its featu...
163,47,22,-19,79,( ) A. -256 B. -115 C. 181 D. 223答案A解析数列无明显特征,且起伏明显,考虑递推数列。圈三数,找规律,计算发现47-22×3=-19,即第一项-第二项×3=第三项,经验证,163-47×3=22,22-(-19)×3=79,均满足此规律,则所求项为-19-7...