1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+22+23+24+25+26+27+28+29+30+31+32+33+34+35+36+37+38+39+40+41+42+43+44+45+46+47+48+49+50=1275
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+22+23+24+25+26+27+28+29+30+31+32+33+34+35+36+37+38+39+40+41+42+43+44+45+46+47+48+49+50 = 1286
Câu hỏi
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+22+23+24+25+26+27+28+29+30+31+32+33+34+35+36+37+38+39+40+41+42+43+44+45+46+47+48+49+50=?
Trả lời
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+22+23+24+25+26+27+28+29+30+31+32+33+34+35+36+37+38+39+40+41+42+43+44+45+46+47+48+49+50=1275
học tốt
= ( 1 + 49 ) + ( 2 + 48 ) + ( 3 + 47 ) + ( 4 + 46) + ( 5 + 45 ) + ( 6 + 46)+(7 + 43)+(8 + 42)+(9+41)+(10 +40)+(11+39)+(12+38)+(13+37)+(14+36)+(15+35)+(16+34)+(17+33)+(18+32)+(19+31)+(20+30)
= 50 x 20
=1000
THANK YOU CÁC BẠN MÌNH ĐÃ GIẢI ĐƯỢC RỒI
\(1+2+3+.....+50=\frac{50\cdot51}{2}=1275\)
áp dụng công thức \(1+2+3+....+n=\frac{n\left(n+1\right)}{2}\)
minh tính ra = 1275
HỌC TỐT TÊN TÚ AND YOU
là 1275
học tốt
k cho minh nha^_<
bằng 1275
hc tốt
............
như thúy quỳnh
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+22+23+24+25+26+27+28+29+30+31+32+33+34+35+36+37+38+39+40+41+42+43+44+45+46+47+48+49+50 =1275 nha bạn
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+22+23+24+25+26+27+28+29+30+31+32+33+34+35+36+37+38+39+40+41+42+43+44+45+46+47+48+49+50=1275
