\(\Rightarrow P=\frac{1}{1}-\frac{1}{2}+\frac{1}{2}-\frac{1}{4}+\frac{1}{4}-\frac{1}{7}+......+\frac{1}{46}-\frac{1}{56}\)
\(\Rightarrow P=1-\frac{1}{56}\)
\(\Rightarrow P=\frac{55}{56}\)
P=1-1/2+1/2-1/4+1/4-1/7+...+1/46-1/56
P=1-1/56
P=55/56
\(P=\frac{1}{1.2}+\frac{2}{2.4}+\frac{3}{4.7}+...+\frac{10}{46.56}\)
\(\Rightarrow P=\frac{1}{1}-\frac{1}{2}+\frac{1}{2}-\frac{1}{4}+\frac{1}{4}-\frac{1}{7}+...+\frac{1}{46}-\frac{1}{56}\)
\(\Rightarrow P=1-\frac{1}{56}=\frac{55}{56}\)
Cách lm thì các bn đã lm r
