问题 解答题

根据算式中的数的变化,填写运算符号:

(10______30______20 )______20______60______15

=(300______20)______20______4

=280______20______4

=14______4

=10

答案

(10×30-20 )÷20-60÷15

=(300-20)÷20-4

=280÷20-4

=14-4

=10

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