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On line Solution of Monovariate Equation：
Input any unary equation directly, and then click the "Next" button to obtain the solution of the equation.
It supports equations that contain mathematical functions.
Input any unary equation directly, and then click the "Next" button to obtain the solution of the equation.
It supports equations that contain mathematical functions.
Current location：Equations > Monovariate Equation > The history of univariate equation calculation > Answer
Overview: 1 questions will be solved this time.Among them
☆1 equations
[ 1/1 Equation]
Work: Find the solution of equation 2×3.14×r+12.9 = 2×3.14×r×0.75+2r .
Question type: Equation
Solution:Original question:
| 2 | × | 157 50 | r | + | 129 10 | = | 2 | × | 157 50 | r | × | 3 4 | + | 2 | r |
| Left side of the equation = | 157 25 | r | + | 129 10 |
157 25 | r | + | 129 10 | = | 2 | × | 157 50 | r | × | 3 4 | + | 2 | r |
| Right side of the equation = | 471 100 | r | + | 2 | r |
| = | 671 100 | r |
157 25 | r | + | 129 10 | = | 671 100 | r |
Transposition :
157 25 | r | − | 671 100 | r | = | - | 129 10 |
Combine the items on the left of the equation:
| - | 43 100 | r | = | - | 129 10 |
By shifting the terms and changing the symbols on toth sides of the equation, we obtain :
129 10 | = | 43 100 | r |
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 :
43 100 | r | = | 129 10 |
The coefficient of the unknown number is reduced to 1 :
| r | = | 129 10 | ÷ | 43 100 |
| = | 129 10 | × | 100 43 |
| = | 3 | × | 10 |
We obtained :
| r | = | 30 |