Overview: 1 questions will be solved this time.Among them
           ☆1 equations

[ 1/1 Equation]
    Work: Find the solution of equation n+n(n-3)/2 = 10 .
    Question type: Equation
    Solution:Original question:

n

+

n

(

n

−

3

)

÷

2

=

10

    Remove the bracket on the left of the equation:

Left side of the equation =

n

+

n

n

×

1 2

−

n

×

3

×

1 2

=

n

+

n

n

×

1 2

−

n

×

3 2

=

-

1 2

n

+

n

n

×

1 2

    The equation is transformed into :

-

1 2

n

+

n

n

×

1 2

=

10

    After the equation is converted into a general formula, it is converted into:
    ( n + 4 )( n - 5 )=0
    From
        n + 4 = 0
        n - 5 = 0
    it is concluded that:：
        n₁=-4
        n₂=5    
    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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