6+8+10+,20+22+24/7+9+11+,+21+23+25等于多少
问题描述:
6+8+10+,20+22+24/7+9+11+,+21+23+25等于多少
答
6+8+10+,20+22+24/7+9+11+,+21+23+25
=(6+24)*(24/2-6-1)/(7+25)*[(25-1)/2-7]
=30*5/32*5
=15/16