tính nhanh:
a]1+4+7+10+....+52+55+58-410
b]1*2+2*3+3*4+....+98*99
c]1/7+1/8+1/9+1/10+1/11+1/12+1/14+1/15+1/18+1/22+1/24+1/28+1/33
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
Tính: \(S=\frac{92-\frac{1}{9}-\frac{2}{10}-\frac{3}{11}-....-\frac{90}{98}-\frac{91}{99}-\frac{92}{100}}{\frac{1}{45}+\frac{1}{50}+\frac{1}{55}+....+\frac{1}{495}+\frac{1}{500}}\)
Giúp mình nha! ^_^
tính nhanh
a,(1-1/10)+(1-1/11)+(1-1/12)+...+(1-1/99)+(1-1/100)
b,1/2*3+1/2*4+1/4*5+...+1/99*100
Tính nhanh
a) 1+3+5+7+9+11+13+15+17+19
b) 4+8+12+16+.....+200
c) 2+4+6+8+...+98+100- (1+3+5+...+97+99)
Bài 1,1+2+3+...+x = 1176
Bài 3 , Tính nhanh :1/1*2+1/2*3 +1/3*4 + ...+ 1/98*99
Bài 4 , Tính nhanh :1/6 +1/12+1/20+ ...+1/110
Bài 5 , Tìm x : 1 /3 +1/6+1/10+...+1/x* (x+1:2)+2009/2011
Tính nhanh:
37 x 27 + 63 x 27
1+2+3+4+...+97+98+99
1+2+3+4+5+6+7+8+9+10
tính nhanh
a)100-98+96-94+...+4-2
b)1+2-3-4+5+6-7+-8+9+10-11-12+13+2010
c)(864x11-423x4):(432x(3+6+9+...+27-132))
d)1x2+2x3+3x4+...+99x100
e)\(\frac{1+\left(1+2\right)+\left(1+2+3\right)+\left(1+2+3+4\right)+...+\left(1+2+3+...+99\right)}{1x9+2x98+3x97\: +....+99x1}\)
giúp mk với , mk tick cho 3 tick , nha !!!!
Tính nhanh: A = (1+1/2)*(1+1/3)*(1+1/4)*...............*(1+1/98)*(1+1/99)