题目内容
脱式计算
517-42÷6
12×(83-74)
(45+25)÷5.
517-42÷6
12×(83-74)
(45+25)÷5.
(1)517-42÷6
=517-7
=510
(2)12×(83-74)
=12×9
=108
(3)(45+25)÷5
=70÷5
=14
=517-7
=510
(2)12×(83-74)
=12×9
=108
(3)(45+25)÷5
=70÷5
=14
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