(1)1.9×32×125×0.25
(2)5.6×69.32+138.64×0.05+693.2+0.43
(3)20000÷12.5÷25÷0.8÷4
(4)2.74÷十四分之五+7.26×2.8
十四分之五打不出来
只好用汉字表示了
大家谅解啊
(1)1.9×32×125×0.25
=1.9×4×0.25×8×125
=1.9×1×1000
=1900
(2)5.6×69.32+138.64×0.05+693.2×←(是乘吧?)0.43
=69.32×5.6+69.32×0.1+69.32×4.3
=69.32×(5.6+0.1+4.3)
=69.32×10
=693.2
(3)20000÷12.5÷25÷0.8÷4
=20000÷(12.5×0.8×25×4)
=20000÷1000
=20
(4)2.74÷14/5+7.26×2.8
=2.74×14/5+7.26×14/5
=(2.74+7.26)×14/5
=10×14/5
=28
=1.9×4×0.25×8×125
=1.9×1×1000
=1900
(2)5.6×69.32+138.64×0.05+693.2×←(是乘吧?)0.43
=69.32×5.6+69.32×0.1+69.32×4.3
=69.32×(5.6+0.1+4.3)
=69.32×10
=693.2
(3)20000÷12.5÷25÷0.8÷4
=20000÷(12.5×0.8×25×4)
=20000÷1000
=20
(4)2.74÷14/5+7.26×2.8
=2.74×14/5+7.26×14/5
=(2.74+7.26)×14/5
=10×14/5
=28
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第1个回答 2011-04-05
(1)1.9×32×125×0.25
=1.9×(4×8)×125×0.25
=1.9×(4×0.25)×(8×125)
=1.9×1×1000
=190
(2)5.6×69.32+138.64×0.05+693.2+0.43×693.2
=5.6×69.32+69.32×2×0.05+69.32×10+4.3×69.32
=69.32×(5.6+0.1+10+4.3)
=69.32×20
=1386.4
(3)20000÷12.5÷25÷0.8÷4
=20000÷(12.5×0.8×25×4)
=20000÷1000
=20
(4)2.74÷14/5+7.26×2.8
=2.74×14/5+7.26×14/5
=(2.74+7.26)×14/5
=10×14/5
=28
=1.9×(4×8)×125×0.25
=1.9×(4×0.25)×(8×125)
=1.9×1×1000
=190
(2)5.6×69.32+138.64×0.05+693.2+0.43×693.2
=5.6×69.32+69.32×2×0.05+69.32×10+4.3×69.32
=69.32×(5.6+0.1+10+4.3)
=69.32×20
=1386.4
(3)20000÷12.5÷25÷0.8÷4
=20000÷(12.5×0.8×25×4)
=20000÷1000
=20
(4)2.74÷14/5+7.26×2.8
=2.74×14/5+7.26×14/5
=(2.74+7.26)×14/5
=10×14/5
=28