Overview: 2 questions will be solved this time.Among them
           ☆1 inequalities
           ☆1 calculations of prime factor

[ 1/2Inequality]
    Assignment:Find the solution set of inequality (-2x+160)(x-30) > 0 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         ( -2 * x + 160 ) * ( x - 30 ) > 0         (1)

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    From inequality(1)：
         30 < x < 80

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    The final solution set is :
         30 < x < 80
[2/2 Digtal analysis]
    Work：Break 800 into prime factors.
    Question type: Resolving prime factor
    Solution:
        800=2*2*2*2*2*5*5
    *Note: 800 has 7 prime factors.

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