4分之3+9分之5×20分之3
=3/4+1/12
=9/12+1/12
=5/6
(3分之1+7分之2)×17分之5
=(7/21+6/21)x5/17
=13/21x5/17
=65/357
如果本题有什么不明白可以追问,请及时点击右下角的【采纳为满意回答】按钮
4分之3+9分之5×20分之3
=3/4+1/12
=9/12+1/12
=5/6
(3分之1+7分之2)×17分之5
=(7/21+6/21)x5/17
=13/21x5/17
=65/357
如果本题有什么不明白可以追问,请及时点击右下角的【采纳为满意回答】按钮