Question

12intregi1supra 2+23intregi7supra 2
Dau coroana va rog grabitiva va rog ajutatima

Answer 1

12 int1/2+23int7/2=
25/2+53/2=78/2=39

Answer 2

Scoatem intregii:12 intregi 1 supra 2=$\frac{12*2+1}{2}$=25/2

23 intregi 7 supra 2=$\frac{23*2+7 }{2}$=53/2

Deci 25/2+53/2= 78/2=39...
 BAFTA!!