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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.
    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 （X-4）*(200+20*(10-X)/0.1) = 2400 .
    Question type: Equation
    Solution:Original question:
     ( X − 4)(200 + 20(10 − X ) ÷
1
10
) = 2400
    Remove the bracket on the left of the equation:
     Left side of the equation = X (200 + 20(10 − X ) ÷
1
10
) − 4(200 + 20(10 − X ) ÷
1
10
)
                                             = X × 200 + X × 20(10 − X ) ÷
1
10
 − 4(200 + 20(10 − X ) ÷
1
10
)
                                             = X × 200 + X × 200(10 − X ) − 4(200 + 20(10 − X ) ÷
1
10
)
                                             = 200 X + X × 200 × 10 − X × 200 X − 4(200 + 20(10 − X ) ÷
1
10
)
                                             = 200 X + X × 2000 − X × 200 X − 4(200 + 20(10 − X ) ÷
1
10
)
                                             = 2200 X − X × 200 X − 4(200 + 20(10 − X ) ÷
1
10
)
                                             = 2200 X − X × 200 X − 4 × 200 − 4 × 20(10 − X ) ÷
1
10
                                             = 2200 X − X × 200 X − 800 − 800(10 − X )
                                             = 2200 X − X × 200 X − 800 − 800 × 10 + 800 X
                                             = 2200 X − X × 200 X − 800 − 8000 + 800 X
                                             = 3000 X − X × 200 X − 8800
    The equation is transformed into :
     3000 X − X × 200 X − 8800 = 2400

    After the equation is converted into a general formula, it is converted into:
    ( X - 7 )( X - 8 )=0
    From
        X - 7 = 0
        X - 8 = 0
    it is concluded that:：
        X1=7
        X2=8    
    There are 2 solution(s).

解一元二次方程的详细方法请参阅：《一元二次方程的解法》


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