题目内容
(2004?姜堰市)脱式计算:
(1)(2296+7344÷36)×2.4
(2)1÷0.45÷0.9-
(3)0.36×[(2+3.8)÷0.04]
(4)(8-1.24)÷3 (得数保留一位小数)
(1)(2296+7344÷36)×2.4
(2)1÷0.45÷0.9-
| 7 | 8 |
(3)0.36×[(2+3.8)÷0.04]
(4)(8-1.24)÷3 (得数保留一位小数)
分析:利用四则混合运算的计算顺序计算.
解答:解:(1)(2296+7344÷36)×2.4
=(2296+204)×2.4
=2500×2.4
=6000;
(2)1÷0.45÷0.9-
=1×
×
-
=
-
=
=
;
(3)0.36×[(2+3.8)÷0.04]
=0.36×[5.8÷0.04]
=0.36×145
=52.2;
(4)(8-1.24)÷3
=6.76÷3
≈2.3.
=(2296+204)×2.4
=2500×2.4
=6000;
(2)1÷0.45÷0.9-
| 7 |
| 8 |
=1×
| 20 |
| 9 |
| 10 |
| 9 |
| 7 |
| 8 |
=
| 200 |
| 81 |
| 7 |
| 8 |
=
| 1600-567 |
| 648 |
=
| 1033 |
| 648 |
(3)0.36×[(2+3.8)÷0.04]
=0.36×[5.8÷0.04]
=0.36×145
=52.2;
(4)(8-1.24)÷3
=6.76÷3
≈2.3.
点评:注意特殊题目的要求.
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