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Work: Find the solution of equation 1/(4n*(4n-1))+1/(4n*(4n+3)) = 0 .
Question type: Equation
Solution:Original question: | 1 | ÷ | ( | 4 | n | ( | 4 | n | − | 1 | ) | ) | + | 1 | ÷ | ( | 4 | n | ( | 4 | n | + | 3 | ) | ) | = | 0 |
Multiply both sides of the equation by: | ( | 4 | n | ( | 4 | n | − | 1 | ) | ) |
| 1 | + | 1 | ÷ | ( | 4 | × | 1 | ( | 4 | n | + | 3 | ) | ) | × | ( | 4 | × | 1 | ( | 4 | n | − | 1 | ) | ) | = | 0 |
Remove a bracket on the left of the equation::
| 1 | + | 1 | ÷ | ( | 4 | × | 1 | ( | 4 | n | + | 3 | ) | ) | × | 4 | × | 1 | ( | 4 | n | − | 1 | ) | = | 0 |
The equation is reduced to :
| 1 | + | 4 | ÷ | ( | 4 | × | 1 | ( | 4 | n | + | 3 | ) | ) | × | ( | 4 | n | − | 1 | ) | = | 0 |
Multiply both sides of the equation by: | ( | 4 | × | 1 | ( | 4 | n | + | 3 | ) | ) |
| 1 | ( | 4 | × | 1 | ( | 4 | n | + | 3 | ) | ) | + | 4 | ( | 4 | n | − | 1 | ) | = | 0 |
Remove a bracket on the left of the equation:
| 1 | × | 4 | × | 1 | ( | 4 | n | + | 3 | ) | + | 4 | ( | 4 | n | − | 1 | ) | = | 0 |
The equation is reduced to :
| 4 | ( | 4 | n | + | 3 | ) | + | 4 | ( | 4 | n | − | 1 | ) | = | 0 |
Remove a bracket on the left of the equation:
| 4 | × | 4 | n | + | 4 | × | 3 | + | 4 | ( | 4 | n | − | 1 | ) | = | 0 |
The equation is reduced to :
| 16 | n | + | 12 | + | 4 | ( | 4 | n | − | 1 | ) | = | 0 |
Remove a bracket on the left of the equation:
| 16 | n | + | 12 | + | 4 | × | 4 | n | − | 4 | × | 1 | = | 0 |
The equation is reduced to :
The equation is reduced to :
Transposition :
Combine the items on the right of the equation:
The coefficient of the unknown number is reduced to 1 :
We obtained :
However,when simplifying the equation, multiply both sides by ( | 4 | n | ( | 4 | n | − | 1 | ) | ) | , and when
, its value is 0. Therefore, the value of this unknown number is not the solution of the equation, and the input to the equation is incorrect.
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