1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20= ai lm đc em cho hay nhất ạ
2 câu trả lời
`1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20`
`= (1 + 19) + (2+18) + ( 3 +17) + ( 4 +16) + ( 5+15) + (6+14) + ( 7+13) + ( 8+12) + (9 +11) + 20 +10`
`=20 +20 + 20 +20 + 20 + 20 +20 +20 +20 +20 +10`
=20 x10 +10
`=210`
Đáp án:
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20=210
Khanh6a4
Chúc bn hc tốt !
