A = 1/1*2 + 1/2*3 + 1/3*4 + 1/4*5 + 1/5*6
A = 1 - 1/2 + 1/2 - 1/3 + 1/3 -1/4 + 1/4 - 1/5 + 1/5 - 1/6
A= 1- 1/6
A = 5/6
A = 1/1 x 2 + 1/2 x 3 + 1/2 x 4 = 1/4 x 5 + 1/5 x6
A = 1 - 1/2 - 1/2 - 1/3 - 1/3 - 1/4 - 1/4 - 1/5 - 1/5 - 1/6
A = 1 - 1/6
A = 5/6
A=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6
A=1-1/6
A=5/6
\(A=\frac{1}{1\times2}+\frac{1}{2\times3}+\frac{1}{3\times4}+\frac{1}{4\times5}+\frac{1}{5\times6}\)
\(\Rightarrow A=1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+\frac{1}{4}-\frac{1}{5}+\frac{1}{5}-\frac{1}{6}\)
\(\Rightarrow A=1-\frac{1}{6}\)
\(\Rightarrow A=\frac{5}{6}\)
A = 1/1*2 + 1/2*3 + 1/3*4 + 1/4*5 + 1/5*6
A = 1/1 - 1/2 + 1/2 - 1/3 + 1/3 - 1/4 +... + 1/5 - 1/6
A = 1/1 - 1/6
A = 5/6
Vậy A = 5/6
A = 1/1x2 + 1/2x3 + 1/3x4 + 1/4x5 + 1/5x6
A = 1 - 1/2 + 1/2 - 1/3 + 1/3 - 1/4 + 1/4 - 1/5 + 1/5 - 1/6
A = 1 - 1/6
A = 5/6
cái này dễ nhưng ko phải của lớp 5!!!
A = 5/6
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A = 1/1x2 + 1/2x3 + 1/3x4 + 1/4x5 + 1/5x6
A = 1 - 1/2 + 1/2 - 1/3 + 1/3 - 1/4 + 1/4 - 1/5 + 1/5 - 1/6
A = 1 - 1/6
A = 5/6
ê nubitakun cậu học ngu lắm mà sao cậu lại trả lời
\(A=\frac{1}{1\times2}+\frac{1}{2\times3}+...+\frac{1}{5\times6}\)
\(A=1-\frac{1}{6}\)
\(A=\frac{5}{6}\)
A=(1/2-1/2)+(1/3-1/3)+(1/4-1/4)+(1/5-1/5)+(1/1-1/6)
A=0 + 0 + 0 + 0 + (6/6-1/6)
A=5/6
\(A=\frac{1}{1x2}+\frac{1}{2x3}+\frac{1}{3x4}+\frac{1}{4x5}+\frac{1}{5x6}\)
\(A=1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+\frac{1}{4}-\frac{1}{5}+\frac{1}{5}-\frac{1}{6}\)
\(A=1-\frac{1}{6}\)
\(A=\frac{5}{6}\)