题目内容
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
(10______30______20 )______20______60______15
=(300______20)______20______4
=280______20______4
=14______4
=10
(10×30-20 )÷20-60÷15
=(300-20)÷20-4
=280÷20-4
=14-4
=10
=(300-20)÷20-4
=280÷20-4
=14-4
=10
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