1+2+3+6+7+3
=1+2+2+1+6+7+3
=2+4+6+7
=2+10+10
=2+10*2
=2+20
=22
k nha
1 + 2 + 3 + 6 + 7 + 3
= 3 + 9 + 10
= 12 + 10
= 22
1 + 2 + 3x2 + 6 + 7
= 1 + 2 + 6 + 6+7
= 7 x 2 + 2 + 6
= 14 + 8
= 22.
neu tinh bang cach thuan tien thi
(7+3)+(6+3+1)+2=
10+10+2
=22