求助一道prep的数学题

彭小荟

问 4^(2/1)+4^(1/3)+4^(1/4)=?
A. less than 2
B. between 2 and 3
C. equal to 4
D. greater than 4
求各位大神帮忙解答呜呜呜

2bethere

4^(1/2)=2
4^(1/4)=(4^(1/2))^(1/2)=2^(1/2)=1.414...

1.414<4^(1/3)<2

2+1.414+1.x>4
Pick D.