15- 5y is the right one.the difference between A and b means A-b
here the A means 15 and the B mean the product of 5 and y
the difference between 15 and the product of 5 and y
the difference between 15 and the product of 5 and y
5y-15 和 15-5y.哪个是对的,为什么?（一定要为什么!
5y-15 和 15-5y.哪个是对的,为什么?（一定要为什么!
英语人气：606 ℃时间：2019-10-24 09:46:38
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