Question

1+2+3+4+5+6+7+8+9

Answer 1

45 tích  nhé !

Answer 2

=(1+9)+(2+8)+(3+7)+(4+6)+5

=10+10+10+10+5

=10x4+5

=40+5

=45

k nha

Answer 3

1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9

= ( 1 + 9 ) + ( 2 + 8 ) + ( 3 + 7 ) + ( 4 + 6 ) + 5

= 10 + 10 + 10 + 10 + 5

= 10 x 4 + 5

= 40 + 5

= 45

Answer 4

= 45

k em em k lại

Answer 5

1 + 2 + 3 + 4 + 5 + 6 + 7+ 8 + 9

= (1 + 9) + (2 + 8) + (3 + 7) + (4 + 6) + 5

= 10 + 10 + 10 + 10 + 5

= 10 . 4 + 5

= 40 + 5

= 45

ủng hộ nha!