\(\frac{2^2.3^3.5^7}{2^3.3^4.5^6}=\frac{1.1.5}{2.3.1}=\frac{5}{6}\)

Làm tương tự 

fgghhh

f

D= 1/1 - 1 /2 + 1/2 - 1/4 + 1/4 - 1/7 +...+ 1/46 - 1/56

D= 1/1 - 1/56

D=  55/56

vậy D= 55/56

P=\(1-\frac{1}{2}+\frac{1}{2}-\frac{1}{4}+\frac{1}{4}-\frac{1}{7}+...+\frac{1}{46}-\frac{1}{56}\)

P=\(1-\frac{1}{56}\)

P=\(\frac{55}{56}\)

P = 1 - 1/2 + 1/2 - 1/4 +.......+1/46 - 1/56

P = 1 - 1/56

P = 55/56 nha!

dễ thôi 

P= 1/1.2 + 2/2.4 + 3/4.7 + ... + 10/46.56 

P= 1- 1/2 + 1/2 - 1/4 + 1/4 -1/7 +... + 1/46 - 1/56

P=1 - 1/56

P=55/56

Ta có : 

\(C=\frac{2}{1.2}+\frac{4}{2.4}+\frac{6}{4.7}+\frac{8}{7.11}+\frac{10}{11.16}+\frac{12}{16.22}\)

\(C=2\left(\frac{1}{1.2}+\frac{2}{2.4}+\frac{3}{4.7}+\frac{4}{7.11}+\frac{5}{11.16}+\frac{6}{16.22}\right)\)

\(C=2\left(\frac{1}{1}-\frac{1}{2}+\frac{1}{2}-\frac{1}{4}+\frac{1}{4}-\frac{1}{7}+\frac{1}{7}-\frac{1}{11}+\frac{1}{11}-\frac{1}{16}+\frac{1}{16}-\frac{1}{22}\right)\)

\(C=2\left(1-\frac{1}{22}\right)\)

\(C=2-\frac{1}{11}\)

\(C=\frac{21}{11}\)

Vậy \(C=\frac{21}{11}\)

Chúc bạn học tốt ~ 

\(P=1-\frac{1}{2}+\frac{1}{2}-\frac{1}{4}+\frac{1}{4}-\frac{1}{7}+...+\frac{1}{46}-\frac{1}{56}\)

\(P=1-\frac{1}{56}\)

\(P=\frac{55}{56}\)

P= 1/1 -1/2 + 1/2 -1/4 + 1/4 - 1/7 +....+ 1/46 -1/56

P= 1/1 - 1/56

=> P= 55/ 56

Có \(\frac{1}{1.2}=\frac{1}{1}-\frac{1}{2}\)

\(\frac{2}{2.4}=\frac{1}{2}-\frac{1}{4}\)......................... tương tự đến \(\frac{10}{46.56}=\frac{1}{46}-\frac{1}{56}\)

suy ra P= 1-\(\frac{1}{56}\)=\(\frac{55}{56}\)

Pò Sữa,  3/4.7  tách ra sao ?

P=1-\(\frac{1}{2}\)+\(\frac{1}{2}\)-\(\frac{1}{4}\)+...........+\(\frac{1}{46}\)-\(\frac{1}{56}\)

P=1-\(\frac{1}{56}\)

P=\(\frac{55}{56}\)

p=55/56