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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 30-2x×20-2x = 264 .
Question type: Equation
Solution:Original question:
| 30 | − | 2 | x | × | 20 | − | 2 | x | = | 264 |
| Left side of the equation = | 30 | − | 40 | x | − | 2 | x |
| = | 30 | − | 42 | x |
| 30 | − | 42 | x | = | 264 |
Transposition :
| - | 42 | x | = | 264 | − | 30 |
Combine the items on the right of the equation:
| - | 42 | x | = | 234 |
By shifting the terms and changing the symbols on toth sides of the equation, we obtain :
| - | 234 | = | 42 | 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 :
| 42 | x | = | - | 234 |
The coefficient of the unknown number is reduced to 1 :
| x | = | - | 234 | ÷ | 42 |
| = | - | 234 | × | 1 42 |
| = | - | 39 | × | 1 7 |
We obtained :
| x | = | - | 39 7 |
Convert the result to decimal form :
| x | = | - 5.571429 |