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计算3.14×67+8.2×31.4-90×0.314     &nb

来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/11/01 08:15:22
计算
3.14×67+8.2×31.4-90×0.314              
12.65÷12.5÷0.8          
(32×0.63×0.95)÷(1.6×21×1.9)
(1)3.14×67+8.2×31.4-90×0.314              
=3.14×67+82×3.14-9×3.14              
=3.14×(67+82-9)
=31.4×140
=439.6
(2)12.65÷12.5÷0.8
=12.65÷(12.5×0.8)
=12.65÷10
=1.265
(3)(32×0.63×0.95)÷(1.6×21×1.9)
=(32÷1.6)×(0.63÷21)×(0.95÷1.9)
=20×0.03×0.5
=0.3