题目

脱式计算. (1) (320+280)÷50×4 (2) 400﹣(1300÷65+35) (3) 927÷[630÷(34+36)] (4) [300﹣(56+44)]÷25 答案: (320+280)÷50×4 =600÷50×4 =12×4 =48 400﹣(1300÷65+35) =400﹣(20+35) =400﹣55 =345 927÷[630÷(34+36)] =927÷[630÷70] =927÷9 =103 [300﹣(56+44)]÷25 =[300﹣100]÷25 =200÷25 =8
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