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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-20-1)(40-2x) = 300 .
Question type: Equation
Solution:Original question:
Remove the bracket on the left of the equation:
The equation is transformed into :
This equation has no real solution!
☆1 equations
[ 1/1 Equation]
Work: Find the solution of equation (x-20-1)(40-2x) = 300 .
Question type: Equation
Solution:Original question:
| ( | x | − | 20 | − | 1 | ) | ( | 40 | − | 2 | x | ) | = | 300 |
| Left side of the equation = | x | ( | 40 | − | 2 | x | ) | − | 20 | ( | 40 | − | 2 | x | ) | − | 1 | ( | 40 | − | 2 | x | ) |
| = | x | × | 40 | − | x | × | 2 | x | − | 20 | ( | 40 | − | 2 | x | ) | − | 1 | ( | 40 | − | 2 | x | ) |
| = | 40 | x | − | x | × | 2 | x | − | 20 | × | 40 | + | 20 | × | 2 | x | − | 1 | ( | 40 | − | 2 | x | ) |
| = | 40 | x | − | x | × | 2 | x | − | 800 | + | 40 | x | − | 1 | ( | 40 | − | 2 | x | ) |
| = | 80 | x | − | x | × | 2 | x | − | 800 | − | 1 | ( | 40 | − | 2 | x | ) |
| = | 80 | x | − | x | × | 2 | x | − | 800 | − | 1 | × | 40 | + | 1 | × | 2 | x |
| = | 80 | x | − | x | × | 2 | x | − | 800 | − | 40 | + | 2 | x |
| = | 82 | x | − | x | × | 2 | x | − | 840 |
| 82 | x | − | x | × | 2 | x | − | 840 | = | 300 |