og 数学225~~求救啊~~

linh66

225.A straight pipe 1 yard in length was marked off in
fourths and also in thirds. If the pipe was then cut into
separate pieces at each of these markings, which of
the following gives all the different lengths of the
pieces, in fractions of a yard?
(A1/6 and1/4only
(B)1/4 and 1/3 only
(C)1/6, 1/4 and 1/3
(D)1/12, 1/6, and 1/4
(E)1/12, 1/6 and 1/3
万分感谢呀~~

bbfcsak

选D？
你拿把尺子，选12里面，你会发现如果12按4分之一分的话会有刻度0,3,6,9,12，按1/3分就是0.4.8.12。
那么这些段距离差就有3-0=3,6-4=2,9-8=1这么三种啊。。
那么就是3/12=1/4,2/12=1/6。和1/12这么三种啊！

linh66

明白了~~~~太感谢了~~~~~