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单选题
If n8 = 480 and n7= 12m, what is the value of 3mn?
A
30
B
60
C
90
D
120
E
480
参考答案
参考解析
解析：
n8 = (n7)(n)=12m(n)=480,所以3mn=120。
n8 = (n7)(n)=12m(n)=480,所以3mn=120。
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