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           ☆1 equations

[ 1/1 Equation]
    Work: Find the solution of equation （30-3x）×x = 63 .
    Question type: Equation
    Solution:Original question:

(

30

−

3

x

)

x

=

63

    Remove the bracket on the left of the equation:

Left side of the equation =

30

x

−

3

x

x

    The equation is transformed into :

30

x

−

3

x

x

=

63

    After the equation is converted into a general formula, it is converted into:
    ( x - 3 )( x - 7 )=0
    From
        x - 3 = 0
        x - 7 = 0
    it is concluded that:：
        x₁=3
        x₂=7    
    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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