Question 1

จงหาผลบวกของ $\frac{1}{2 imes3}+\frac{1}{3 imes4}+\frac{1}{4 imes5}+...+\frac{1}{\left(n+1
ight)\left(n+2
ight)}+...$

Accepted Answer

$\frac{1}{2}$

Answer

$\frac{1}{2}$

Answer

$\frac{1}{2}$

Answer

$\frac{1}{2}$

Question 2

จงหาผลบวกของ $\frac{1}{2 imes3}+\frac{1}{3 imes4}+\frac{1}{4 imes5}+...+\frac{1}{\left(n+1
ight)\left(n+2
ight)}+...$

Accepted Answer

$\frac{1}{2}$

Answer

$\frac{1}{2}$

Answer

$\frac{1}{2}$

Answer

$\frac{1}{2}$

Question 3

จงหาผลบวกของ $\frac{1}{2 imes3}+\frac{1}{3 imes4}+\frac{1}{4 imes5}+...+\frac{1}{\left(n+1
ight)\left(n+2
ight)}+...$

Accepted Answer

$\frac{1}{2}$

Answer

$\frac{1}{2}$

Answer

$\frac{1}{2}$

Answer

$\frac{1}{2}$

Question 4

จงหาผลบวกของ $\frac{1}{2 imes3}+\frac{1}{3 imes4}+\frac{1}{4 imes5}+...+\frac{1}{\left(n+1
ight)\left(n+2
ight)}+...$

Accepted Answer

$\frac{1}{2}$

Answer

$\frac{1}{2}$

Answer

$\frac{1}{2}$

Answer

$\frac{1}{2}$

Question 5

จงหาผลบวกของ $\frac{1}{2 imes3}+\frac{1}{3 imes4}+\frac{1}{4 imes5}+...+\frac{1}{\left(n+1
ight)\left(n+2
ight)}+...$

Accepted Answer

$\frac{1}{2}$

Answer

$\frac{1}{2}$

Answer

$\frac{1}{2}$

Answer

$\frac{1}{2}$

Question 6

จงหาผลบวกของ $\frac{1}{2 imes3}+\frac{1}{3 imes4}+\frac{1}{4 imes5}+...+\frac{1}{\left(n+1
ight)\left(n+2
ight)}+...$

Accepted Answer

$\frac{1}{2}$

Answer

$\frac{1}{2}$

Answer

$\frac{1}{2}$

Answer

$\frac{1}{2}$

Question 7

จงหาผลบวกของ $\frac{1}{2 imes3}+\frac{1}{3 imes4}+\frac{1}{4 imes5}+...+\frac{1}{\left(n+1
ight)\left(n+2
ight)}+...$

Accepted Answer

$\frac{1}{2}$

Answer

$\frac{1}{2}$

Answer

$\frac{1}{2}$

Answer

$\frac{1}{2}$

Question 8

จงหาผลบวกของ $\frac{1}{2 imes3}+\frac{1}{3 imes4}+\frac{1}{4 imes5}+...+\frac{1}{\left(n+1
ight)\left(n+2
ight)}+...$

Accepted Answer

$\frac{1}{2}$

Answer

$\frac{1}{2}$

Answer

$\frac{1}{2}$

Answer

$\frac{1}{2}$

Question 9

ข้อใดเป็นอนุกรมลู่เข้า

Accepted Answer

$\frac{1}{2}$

Answer

$\frac{1}{2}$

Answer

$\frac{1}{2}$

Answer

$\frac{1}{2}$

Question 10

ผลบวกของอนุกรม $\frac{1}{2 imes3}+\frac{1}{3 imes4}+\frac{1}{4 imes5}+...+\frac{1}{\left(n+1
ight)\left(n+2
ight)}+...$ เท่ากับข้อใด

Accepted Answer

$\frac{1}{2}$

Answer

Answer

Answer

ไม่สามารถหาผลบวกได้

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