不改变分式的值,使得分式的分子、分母中各项系数都是整数 x+1/3y/2/5x-1/2y !
x+1/3y/2/5x-1/2y
= (x+y/3)/(2x/5-y/2)
=30(x+y/3)/30(2x/5-y/2)
=(30x+10y)/(12x-15y)