= 100 × (100+1) : 2 = 5050
^-^
=100 x (100+1) : 2=5050 nha bạn!
k mình nha ^-^
\(1+2+...+99+100\)
\(=\frac{100.\left(100+1\right)}{2}\)
\(=5050\)
học tốt!!!
= 100 × (100+1) : 2 = 5050
^-^
=100 x (100+1) : 2=5050 nha bạn!
k mình nha ^-^
\(1+2+...+99+100\)
\(=\frac{100.\left(100+1\right)}{2}\)
\(=5050\)
học tốt!!!
1*2*3+2*3*4+3*4*5+....+97*98*99+98*99*100 = ?
1/2 +2/3 +3/4 +4/5+..+99/100
1/99+2/98 +3/97+...+98/2+99/1
help me,ai giải nhanh nhất tớ tick cho
99/1+98/2+97/3+................+2/98+1/99
1/2+1/3+1/4+.......................+1/99+1/100
1+2-3-4+5+6-7-8+...+97+98-99-100+101
Tính nhanh
a.(1+1/2)×(1+1/3)×(1+1/4)×...×(1+1/98)×(1+1/99).
b.1/2×2/3×3/4×...×97/98×98/99×99/100
A=1+2+3+4+5+6...95+96+97+98+99+100+101 = ?
tinh gia tri bieu thuc : a ) : (1+2+3+4+ .............+97+98+99+100) : 5
1+2-3-4+5+6-7-8+9+...+97+98-99-100+101+102
Tính A:B
a)A=98+1/2+1/3+1/4+...+1/99
B=2/3+4/3+5/4+...+100/99
b)A=2018+1/2+1/3+1/4+...+1/2019
B=3/2+4/3+3/4+...+2020/2019
c)A=99/1+98/2+97/3+...+2/98+1/99
B=1/2+1/3+1/4+...+1/100
Giải đầy đủ