15,16题求解,
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15,16题求解,
![](http://img.wesiedu.com/upload/8/90/890d05fc90068f7ad1b18868f4957c39.jpg)
![](http://img.wesiedu.com/upload/8/90/890d05fc90068f7ad1b18868f4957c39.jpg)
![15,16题求解,](/uploads/image/z/16785885-21-5.jpg?t=15%2C16%E9%A2%98%E6%B1%82%E8%A7%A3%2C%26nbsp%3B)
15B
16 原式=10/7*(40/13-20/11)*7/10*143/5*1/36
=(40/13-20/11)*143/5*1/36
=(88-52)*1/36
=1
16 原式=10/7*(40/13-20/11)*7/10*143/5*1/36
=(40/13-20/11)*143/5*1/36
=(88-52)*1/36
=1