=1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19=
=(19+1):2*19=190
vậy tổng đó bằng 190
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19
= ( 1 + 19 ) + ( 2 + 18 ) + ( 3 + 17 ) + ( 4 + 16 ) + ( 5 + 15 ) + ( 6 + 14 ) + ( 7 + 13 ) + ( 8 + 12 ) + ( 9 + 11 ) + 10
= 20 + 20 + 20 + 20 + 20 + 20 + 20 + 20 + 20 + 10
= 180 + 10
= 190
k nhé làm ơn
Ta có :
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19
= ( 1 + 19 ) + ( 2 + 18 ) + ( 3 + 17 ) + ( 4 + 16 ) + ( 5 + 15 ) + ( 6 + 14 ) + ( 7 + 13 ) + ( 8 + 12 ) + ( 9 + 11 ) + 10
= 20 + 20 + 20 + 20 + 20 + 20 + 20 + 20 + 20 + 10
= 180 + 10
= 190
Đáp số : 190
Ta có :
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19
= ( 1 + 19 ) + ( 2 + 18 ) + ( 3 + 17 ) + ( 4 + 16 ) + ( 5 + 15 ) + ( 6 + 14 ) + ( 7 + 13 ) + ( 8 + 12 ) + ( 9 + 11 ) + 10
= 20 + 20 + 20 + 20 + 20 + 20 + 20 + 20 + 20 + 10
= 180 + 10
= 190
Đáp số : 190
=190
k mk nha
thank you các bạn rất nhiều!
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19
= ( 1 + 19 ) + ( 2 + 18 ) + ( 3 + 17 ) + ( 4 + 16 ) + ( 5 + 15 ) + ( 6 + 14 ) + ( 7 + 13 ) + ( 8 + 12 ) + ( 9 + 11 ) + 10
= 20 + 20 + 20 + 20 + 20 + 20 + 20 + 20 + 20 + 10
= 190
hok tốt