脱式计算,能简算的要简算:4.85×1.25×8 6.8÷[(4.5-2.8)×0.4]39÷0.125÷0.8 4.8×0.65+0.65×5.2.
(1)4.85×1.25×8
=4.85×(1.25×8)
=4.85×10
=48.5
(2)6.8÷[(4.5-2.8)×0.4]
=6.8÷[1.7×0.4]
=6.8÷0.68
=10
(3)39÷0.125÷0.8
=39÷(0.125×0.8)
=39÷0.1
=390
(4)4.8×0.65+0.65×5.2
=0.65×(4.8+5.2)
=0.65×10
=6.5
=4.85×(1.25×8)
=4.85×10
=48.5
(2)6.8÷[(4.5-2.8)×0.4]
=6.8÷[1.7×0.4]
=6.8÷0.68
=10
(3)39÷0.125÷0.8
=39÷(0.125×0.8)
=39÷0.1
=390
(4)4.8×0.65+0.65×5.2
=0.65×(4.8+5.2)
=0.65×10
=6.5
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