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计算下面各题. 2.9×1.4+2×0.16 200-(3.05+7.1)×18 30.8÷[14-(9.85+1.07

来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/05/11 18:09:26
计算下面各题.
2.9×1.4+2×0.16 200-(3.05+7.1)×18
30.8÷[14-(9.85+1.07)] (2.44-1.8)÷0.4×20.
(1)2.9×1.4+2×0.16,
=4.06+0.32,
=4.38;
(2)200-(3.05+7.1)×18,
=200-10.15×18,
=200-182.7,
=17.3;
(3)30.8÷[14-(9.85+1.07)],
=30.8÷[14-10.92],
=30.8÷3.08,
=10;
(4)(2.44-1.8)÷0.4×20,
=0.64÷0.4×20,
=0.256×20,
=5.12.