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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