A = 1/1.2 + 1/3.4 + 1/5.6 + ... + 1/49.50
A =1 - 1/2 + 1/3 - 1/4 + 1/5 - 1/6 + ... + 1/49 - 1/50
A = (1 + 1/3 + 1/5 + ... + 1/49) - (1/2 + 1/4 + 1/6 + ... + 1/50)
A = (1 + 1/2 + 1/3 + 1/4 + 1/5 + 1/6 + ... + 1/49 + 1/50) - 2.(1/2 + 1/4 + 1/6 + ... +1/50)
A = B - 2C
=> đpcm
Ủng hộ mk nha ♡_♡☆_☆
CMR :
1/1.2 + 1/3.4 + 1/5.6 +.........+ 1/49.50 = 1/26 + 1/27 +.......+ 1/49 + 1/50.
Tim cac gia tri cua x de cac bieu thuc sau day nhan gia tri am :
a) x2 + 5x = A.
b) 3.(2x + 3) . (3x - 5).
Ai biet thi chi giup minh hai bai toan tren nhe ! Xin cam on moi nguoi. (Cang nhan cang tot,hihi)
Tim so nguyen x, biet :
a) (1/2 - 1/3) . 6x + 6x + 2 = 615 + 618.
b) (1/2 - 1/6) . 3x + 4 - 4 . 3x = 316 - 4 . 313.
Minh dang can gap. Ai biet thi chi giup minh voi nhe! Cam on moi nguoi .
Chứng minh rằng:
a) 1.2 - 1 phần 2! + 2.3 -1 phần 3! + 3.4 -1/4! + ... + 99.100 -1 /100! < 2
b) 1/1.2 + 1/3.4 + 1/5.6 + ... + 1/49.50 = 1/26 + 1/27 + 1/28 + ... + 1/50
a) CMR 1/1.2+1/3.4+1/4.5+...+1/49.50=1/26+1/27+...+1/50
b) so sánh
A= 1/3^2-1/3^4+1/3^6-1/3^8+...+1/3^2006-1/3^2008
CMR : \(\frac{1}{1.2}+\frac{1}{3.4}+\frac{1}{5.6}+...+\frac{1}{49.50} =\frac{1}{26}+\frac{1}{27}+...+\frac{1}{49}+\frac{1}{50}\)
☹➞cac ban giup minh cau nay voi
☛ tinh tong
M = 1+\(\dfrac{1}{5}\)+\(\dfrac{3}{35}\)+...\(\dfrac{3}{9603}\)+\(\dfrac{3}{9999}\)
➜giup minh nhanh nhe minh dang can gap lam moi nguoi a
➞thank you cac ban ❕
CMR: 1/1.2+1/2.3+1/3.4+....+1/49.50=1/26+1/27+.....+1/49+1/50
Các bạn trình bày chi tiết cho mik nhé!! Có j mik like cho...
a. x \(\div\)( 1/1*3 + 1/3*5 + ...... + 1/101*103 ) =1 .
b.( 1/1*2 + 1/2*3 + 1/3*4 + ........ + 1/11*12) * x =2
c. x : 3/4 = 2x * 7/3 +5
Cac ban giai theo dang tim x nha . Cam on nhieu. Nhanh nhe vi minh can gap
Chứng minh rằng:
A=1\1.2 + 1\3.4 + 1\5.6 + ... + 1\49.50 = 1\26 + 1\27 + 1\28 + ... + 1\50
Có lời giải hay nhất 3 li ke
