对于数X、Y规定运算“O”为XOY=(X+4)*(Y-3)求7〇（8〇9)的值（）。A.300 B.429 C.672 D.759

作者: rantiku 人气: - 评论: 0

问题对于数X、Y规定运算“O”为XOY=(X+4)*(Y-3)求7〇（8〇9)的值（）。 A.300 B.429 C.672 D.759

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答案 D

解析 8〇9=(8+4)×(9-3)=72，7〇72=（7+4)×(72-3）=759,即 7〇(8〇9)=759。

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