问题 解答题

求未知数x.

x÷18=40               x×30=450              88-x=71.

答案

(1)x÷18=40,

         x=40×18,

         x=720;

(2)x×30=450,

          x=450÷30,

          x=15;

(3)88-x=71,

        x=88-71,

        x=17.

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