Question

вычесли удобным способом 8+3+4;6+7+2;4+6+5;12-4-2;12-7-4;6+7+3

Answer 1

8+3+4 = 15
6+7+2 = 15
4+6+5 = 15
12-4-2 = 6
12-7-4 = 1
6+7+3 = 16

Answer 2

$8+3+4=15 \ 6+7+2=15 \ 4+6+5=15 \ 12-4-2=6 \ 12-7-4=1 \ 6+7+3=16$