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It supports mathematical functions (including trigonometric functions).
Current location：Mathematical operation > History of Mathematical Computation > Answer
Overview: 2 questions will be solved this time.Among them
☆1 inequalities
☆1 equations
[ 1/2Inequality]
Assignment:Find the solution set of inequality 240a+200(20-a) >4500 .
Question type: Inequality
Solution:
The inequality can be reduced to 1 inequality：
240 * a + 200 * ( 20 - a ) >4500 (1)
From inequality(1)：
a ＞ 25/2
The final solution set is :
a ＞ 25/2
[ 2/2 Equation]
Work: Find the solution of equation 12a+10(20-a) = 230 .
Question type: Equation
Solution:Original question:
Remove the bracket on the left of the equation:
The equation is transformed into :
Transposition :
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 inequalities
☆1 equations
[ 1/2Inequality]
Assignment:Find the solution set of inequality 240a+200(20-a) >4500 .
Question type: Inequality
Solution:
The inequality can be reduced to 1 inequality：
240 * a + 200 * ( 20 - a ) >4500 (1)
From inequality(1)：
a ＞ 25/2
The final solution set is :
a ＞ 25/2
[ 2/2 Equation]
Work: Find the solution of equation 12a+10(20-a) = 230 .
Question type: Equation
Solution:Original question:
| 12 | a | + | 10 | ( | 20 | − | a | ) | = | 230 |
| Left side of the equation = | 12 | a | + | 10 | × | 20 | − | 10 | a |
| = | 12 | a | + | 200 | − | 10 | a |
| = | 2 | a | + | 200 |
| 2 | a | + | 200 | = | 230 |
Transposition :
| 2 | a | = | 230 | − | 200 |
Combine the items on the right of the equation:
| 2 | a | = | 30 |
The coefficient of the unknown number is reduced to 1 :
| a | = | 30 | ÷ | 2 |
| = | 30 | × | 1 2 |
| = | 15 | × | 1 |
We obtained :
| a | = | 15 |