212×14+214×16+216×18+218×20+120.

212×14+214×16+216×18+218×20+120.


212×14+214×16+216×18+218×20+120,=112-114+114-116+116-118+118-120+120,=112.



How to calculate the simple method of 2 / 12 * 14 + 2 / 14 * 16 + 2 / 16 * 18 + 2 / 18 * 20 + 2 / 20 * 22 + 2 / 20 * 22 + 1 / 22


2/12*14+2/14*16+2/16*18+2/18*20+2/20*22+2/20*22+1/22
=(14/12*14-12/12*14)+(16/14*16-14/14*16).+1/12
=1/12-1/14+1/14-1/16+.-1/22+1/22
=1/12



What's 5 and 2 / 6 times 2?


It's 10 and two-thirds, absolutely right,