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It supports mathematical functions (including trigonometric functions).
Current location：Mathematical operation > History of Mathematical Computation > Answer
Overview: 1 questions will be solved this time.Among them
☆1 equations
[ 1/1 Equation]
Work: Find the solution of equation X+9 = X×3-21 .
Question type: Equation
Solution:Original question:
Transposition :
Combine the items on the left of the equation:
Combine the items on the right of the equation:
By shifting the terms and changing the symbols on toth sides of the equation, we obtain :
If the left side of the equation is equal to the right side, then the right side must also be equal to the left side, that is :
The coefficient of the unknown number is reduced to 1 :
We obtained :
This is the solution of the equation.
☆1 equations
[ 1/1 Equation]
Work: Find the solution of equation X+9 = X×3-21 .
Question type: Equation
Solution:Original question:
| X | + | 9 | = | X | × | 3 | − | 21 |
Transposition :
| X | − | 3 | X | = | - | 21 | − | 9 |
Combine the items on the left of the equation:
| - | 2 | X | = | - | 21 | − | 9 |
Combine the items on the right of the equation:
| - | 2 | X | = | - | 30 |
By shifting the terms and changing the symbols on toth sides of the equation, we obtain :
| 30 | = | 2 | X |
If the left side of the equation is equal to the right side, then the right side must also be equal to the left side, that is :
| 2 | X | = | 30 |
The coefficient of the unknown number is reduced to 1 :
| X | = | 30 | ÷ | 2 |
| = | 30 | × | 1 2 |
| = | 15 | × | 1 |
We obtained :
| X | = | 15 |