题目内容
【题目】脱式计算
(1)15
﹣(2
+3
)
(2)84×[10.8÷(48.6+5.4)﹣0.2]
(3)34
×24+66
×24﹣47
÷![]()
(4)[36﹣2÷(0.5﹣
)×1
]÷(1
÷0.65)
【答案】(1)15
﹣(2
+3
)
=15
﹣2
﹣3![]()
=15
﹣3
﹣2![]()
=12﹣2![]()
=9
;
(2)84×[10.8÷(48.6+5.4)﹣0.2]
=84×[10.8÷54﹣0.2]
=84×[0.2﹣0.2]
=84×0
=0;
(3)34
×24+66
×24﹣47
÷![]()
=34
×24+66
×24﹣47
×24
=(34
+66
﹣47
)×24
=(100
﹣47
)×24
=53×24
=1272;
(4)[36﹣2÷(0.5﹣
)×1
]÷(1
÷0.65)
=[36﹣2÷
×1
]÷2
=[36﹣12×1
]÷2
=[36﹣20]÷2
=16÷2
=8.
【解析】解:(1)15
﹣(2
+3
)
=15
﹣2
﹣3![]()
=15
﹣3
﹣2![]()
=12﹣2![]()
=9
;
(2)84×[10.8÷(48.6+5.4)﹣0.2]
=84×[10.8÷54﹣0.2]
=84×[0.2﹣0.2]
=84×0
=0;
(3)34
×24+66
×24﹣47
÷![]()
=34
×24+66
×24﹣47
×24
=(34
+66
﹣47
)×24
=(100
﹣47
)×24
=53×24
=1272;
(4)[36﹣2÷(0.5﹣
)×1
]÷(1
÷0.65)
=[36﹣2÷
×1
]÷2
=[36﹣12×1
]÷2
=[36﹣20]÷2
=16÷2
=8.
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