1+2+3+4+5+6+7+8+9+10
=(1+9)+(2+8)+(3+7)+(4+6)+10+5
=10+10+10+10+10+5
=55
tổng là
1 + 2 + 3 + 4 + 5 + 6+ 7 + 8 + 9 + 10 =55
đáp số 55
=1+2+3+4+5+6+7+8+9+10
=(1+9)+(2+8)+(3+7)+(4+6)+10+5
=10+10+10+10+10+5
=20+20+10+5
=40+10+5
=50+5
=55
1+2+3+4+5+6+7+8+9+10
=(1+9)+(2+8)+(3+7)+(4+6)+(5+10)
=10+10+10+10+15
=55
1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 +10
= ( 1 + 10 ) + ( 2 + 9 ) + ( 3 + 8 ) + ( 4 + 7 ) + ( 5 + 6 )
= 11 + 11 + 11 + 11 +11
= 11 x 5
= 55
1+2+3+4+5+6+7+8+9+10
=(1+9)+(2+8)+(3+7)+(4+6)+5+10
= 10 + 10 + 10 + 10 +5+10
= 20 + 20 + 5+10
= 40 + 15
55
1+2+3+4+5+6+7+8+9+10=
= (1+9)+(2+8)+(3+7)+(4+6)+10+5
= 10 + 10 + 10 + 10 +10+5
= 50 + 5
= 55 nhak
1 + 2 + 3+ 4 + 5 + 6 + 7 + 8 + 9 + 10
=(1 + 9) + (2 + 8) + (3 + 7) + (4 + 6) + 5 + 10
= 10 + 10 + 10 + 10 + 5 + 10
= 10 + 10 + 10 + 10 + 10 + 5
= 10 x 5 + 5
= 50 + 5
= 55
1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10
= ( 1 + 9 ) + ( 2 + 8 ) + ( 3 + 7 ) + ( 4 + 6 ) + 10 + 5
= 10 + 10 + 10 + 10 + 10 + 5
= ( 10 x 5 ) + 5
= 50 + 5
= 55
Chúc bn hok tốt !