If x and y are positive integers, and x3y4 = 2,000, which of the following is the value of xy?
A. 2
B. 4
C. 8
D. 10
E. 20
2*5=10
2000= 16*125= 2^4*5^3
xy=10
我的想法是2000=2*1000=2*10^3
原题=y*(xy)^3,so xy=10,y=2
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