請教GWD27-35

amywliang

Q35:
The interior of a rectangular carton is designed by a certain manufacturer to have a volume of x cubic feet and a ratio of length to width to height of 3 : 2 : 2. In terms of x, which of the following equals the height of the carton, in feet?

A.3√ x
B.3√ (2x/3)
C.3 √ (3x/2)
D. (2/3) *3√ x
E.(3/2) 3√ x

Ans:B     註:√ =根號...... (不知道看不看的懂)
有沒有人可以告訴我 這是怎麼算出來的啊???

我怎麼都算不出來答案咧.....

mymengming

3t*2t*2t=x


t=(x/12)^(1/3)


height=2t=(2x/3)^(1/3)

选B

B的根号前面的3是^(1/3)的意思