Các câu hỏi tương tự
Cho A=\(\frac{1}{3}.\) \(\frac{4}{6}.\frac{7}{9}.\frac{10}{12}....\frac{208}{210}\)
Chứng minh rằng A<1/25
Cho A=\(\frac{1}{3}.\frac{4}{6}\frac{7}{9}.\frac{10}{12}...\frac{208}{210}\)
CMR: \(\frac{1}{52}
Cho A=\(\frac{1}{3}x\frac{4}{6}x\frac{7}{9}x.....x\frac{208}{210}\)
Chứng minh :A<\(\frac{1}{25}\)
cho a=1/3*4/6*.....208/210
chung minh a<1/25
Chứng minh:
\(\frac{1}{3}\). \(\frac{4}{6}\). \(\frac{7}{9}\).....\(\frac{208}{210}\)< \(\frac{1}{25}\).
Cho A= 1/3*4/6*7/9*10/12*...*244/246. Chứng minh A<1/27
mik đang cần gấp
giúp mik nha ^__^<3
Tim X
3) -12 + (2x – 9) + x= 0
4) 11 + (15 - x) = 1
5) 4 - (27 - 3) = x - (13 - 4)
6) 8 - (x - 10) = 23 - (- 4 +12)
7) 105 – 5(10 – 5x) = -20
8) (x -1)(8-2x)(3x+123) = 0
9) (x2 - 25)(x+ 10) = 0
10) x(x2+5) =
Bài 1: Tìm x [GIÚPPPPPPPPPPPPPPPPPPP]
1) 5 – (10 – x) = 7
2) - 32 - (x – 5) = 0
3) -12 + (2x – 9) + x= 0
4) 11 + (15 - x) = 1
5) 4 - (27 - 3) = x - (13 - 4)
6) 8 - (x - 10) = 23 - (- 4 +12)
7) 105 – 5(10 – 5x) = -20
8) (x -1)(8-2x)(3x+123) = 0
9) (x2 - 25)(x+ 10) = 0
10) x(x2+5) = 0
Bài1: chứng minh rằng
1-1/2+1/3-1/4+1/5-1/6+.......-1/1996=1/996+1/997+.....+1/9996
Bài 2:tính
A=1*3*5*7*.....*99/51*52*......*100
Bài 3: Cho A = 1/6*10+1/7*9+1/8*8+1/9*7+1/10*6 chứng minh rằng A= 1/8*(1/6+1/7+1/8+1/9+1/10)