1 + 9 + 6 + 7 + 3 + 5 + 1 + 5 + 6 + 4
= (1 + 9) + (6 + 4) + (7 + 3) + (5 + 5) + (1 + 6)
= 10 + 10 + 10 + 10 + 7
= 10 x 4 + 7
= 40 + 7
= 47
Ủng hộ mk nha ^_-
1+9+6+7+3+5+1+5+6+4
= ( 1 + 9 ) + 6 + ( 7 + 3 ) + ( 5 + 5 ) + 1 + ( 6 + 4)
= 10 + 10 + 10 + 10 + 7
=47
1=====+=+=+=====+==