A.2.5 B.1 C.-1.5 D.-2.5

Loveyou2019-12-17  11

问题 A.2.5 B.1 C.-1.5 D.-2.5

选项

答案D

解析5X6 + 18 = 48,1X2 + 3 = 5,2X? +5 = 0,? =-2.5,故选 D。
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