题目内容

【题目】计算

(1)3.14×67+8.2×31.490×0.314

(2)12.65÷12.5÷0.8

(3)(32×0.63×0.95)÷(1.6×21×1.9)

【答案】(1)439.6(2)1.265(3)0.3

【解析】

试题分析:(1)根据数字特点,把原式变为3.14×67+82×3.149×3.14,运用乘法分配律的逆运算简算

(2)(3)运用除法的性质简算

解:(1)3.14×67+8.2×31.490×0.314

=3.14×67+82×3.149×3.14

=3.14×(67+829)

=3.14×140

=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

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