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(3.14+5.86)÷45×5.8用简便方法计算?
2个回答
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(3.14+5.86)÷45×5.8
=9÷(9×5)×(5+0.8)
=9÷9÷5×(5+0.8)
=1÷5×(5+0.8)
=1÷5×5+1÷5×0.8
=1+0.16
=1.16
=9÷(9×5)×(5+0.8)
=9÷9÷5×(5+0.8)
=1÷5×(5+0.8)
=1÷5×5+1÷5×0.8
=1+0.16
=1.16
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