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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality (d—1)×20.4×3.690＋2×0×1.921 = [30＋1.5×18.5＋1×18.4＋4×18.9＋4.5×19.2＋2.8×19.5＋(d—1)×20.4] <0.271—2×0×0.414 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         ( d - 1 ) × 20.4 × 3.690 + 2 × 0 × 1.921 ( 30 + 1.5 × 18.5 + 1 × 18.4 + 4 × 18.9 + 4.5 × 19.2 + 2.8 × 19.5 + ( d - 1 ) × 20.4 ) <0.271 - 2 × 0 × 0.414         (1)

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    From inequality(1)：
         -13.351416 < d < 1.000926

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    The final solution set is :
         -13.351416 < d < 1.000926

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