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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-4 = (90-x+4)×80% .
Question type: Equation
Solution:Original question:
Remove the bracket on the right of the equation:
The equation is transformed into :
Transposition :
Combine the items on the left of the equation:
Combine the items on the right of the equation:
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-4 = (90-x+4)×80% .
Question type: Equation
Solution:Original question:
| x | − | 4 | = | ( | 90 | − | x | + | 4 | ) | × | 80 100 |
| Right side of the equation = | 90 | × | 80 100 | − | x | × | 80 100 | + | 4 | × | 80 100 |
| = | 72 | − | x | × | 80 100 | + | 16 5 |
| = | 376 5 | − | 80 100 | x |
| x | − | 4 | = | 376 5 | − | 80 100 | x |
Transposition :
| x | + | 80 100 | x | = | 376 5 | + | 4 |
Combine the items on the left of the equation:
9 5 | x | = | 376 5 | + | 4 |
Combine the items on the right of the equation:
9 5 | x | = | 396 5 |
The coefficient of the unknown number is reduced to 1 :
| x | = | 396 5 | ÷ | 9 5 |
| = | 396 5 | × | 5 9 |
| = | 44 | × | 1 |
We obtained :
| x | = | 44 |