题目内容
【题目】计算。(能简算的要简算)
1.25×5×8 1.42×0.8+1.42×9.2 45-13.4-20.6
4.8÷[12×(19.55-19.54)] 6.4÷[(4.3+2.1)÷0.8] 13.8+8.1×3
【答案】50 14.2 11 40 0.8 38.1
【解析】
1.25×5×8
=1.25×8×5
=10×5
=50
1.42×0.8+1.42×9.2
=1.42×(0.8+9.2)
=1.42×10
=14.2
45-13.4-20.6
=45-(13.4+20.6)
=45-34
=11
4.8÷[12×(19.55-19.54)]
=4.8÷[12×0.01]
=4.8÷0.12
=40
6.4÷[(4.3+2.1)÷0.8]
=6.4÷[6.4÷0.8]
=6.4÷8
=0.8
13.8+8.1×3
=13.8+24.3
=38.1
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