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20 10 Xuzhou three-inspection college entrance examination mathematics questions (reward will be given after completion)
Question 8 Because the score interval of this question is left closed and right open, the algorithm of this question is as follows: 0.1* 70+0.3 * 80+0.4 * 90+0.2 *100 = 87.
Question 9 When x=8, the condition is not satisfied. Only when x=- 1, subtract 3 from x and re-enter it until the condition of x≤0 is met. Therefore, the result can be obtained by substituting the following formula.