【题目】计算竞技场.
640﹣700÷5
642÷6+145
(813﹣288)÷5
(375+225)÷4.
【答案】500;252;105;150
【解析】
试题分析:(1)先算除法,再算减法;
(2)先算除法,再算加法;
(3)(4)先算括号内的,再算括号外的.
解:(1)640﹣700÷5,
=640﹣140,
=500;
(2)642÷6+145,
=107+145,
=252;
(3)(813﹣288)÷5,
=525÷5,
=105;
(4)(375+225)÷4,
=600÷4,
=150.
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