递等式计算(能简便要简便)
[3.78+(4.5-2.78)]×3.56.58×1.012.8×0.56×1.25124.2÷(2.4÷0.2)-5.7...
[3.78+(4.5-2.78)]×3.5
6.58×1.01
2.8×0.56×1.25
124.2÷(2.4÷0.2)-5.7 展开
6.58×1.01
2.8×0.56×1.25
124.2÷(2.4÷0.2)-5.7 展开
展开全部
递等式计算(能简便要简便)
[3.78+(4.5-2.78)]×3.5
=[3.78-2.78+4.5]×3.5
=[1+4.5]×3.5
=5.5×3.5
=19.25
6.58×1.01
=6.58×(1+0.01)
=6.58+6.58×0.01
=6.58+0.0658
=6.6458
2.8×0.56×1.25
=(2.8×0.7)×(0.8×1.25)
=1.96×1
=1.96
124.2÷(2.4÷0.2)-5.7
=124.2÷12-5.7
=10.35-5.7
=4.65
[3.78+(4.5-2.78)]×3.5
=[3.78-2.78+4.5]×3.5
=[1+4.5]×3.5
=5.5×3.5
=19.25
6.58×1.01
=6.58×(1+0.01)
=6.58+6.58×0.01
=6.58+0.0658
=6.6458
2.8×0.56×1.25
=(2.8×0.7)×(0.8×1.25)
=1.96×1
=1.96
124.2÷(2.4÷0.2)-5.7
=124.2÷12-5.7
=10.35-5.7
=4.65
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