如果(am-bn-b)3=a9b15,那么m,n的值等于( )A.m=9,n=-4B.m=3,n=4C.m=4,n=3D.m=9,n=6
题型:单选题难度:简单来源:不详
如果(am-bn-b)3=a9b15,那么m,n的值等于( )A.m=9,n=-4 | B.m=3,n=4 | C.m=4,n=3 | D.m=9,n=6 |
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答案
∵(am•bn•b)3=a3m•b3n•b3=a3m•b3n+3=a9b15, ∴3m=9,3n+3=15, 解得:m=3,n=4. 故选B. |
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