0.47+0.47×0.9简算?
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0.47+0.47×0.9简算
=0.47+0.47×(1-0.1)
=0.47+0.47×1-0.47×0.1
=0.47×(1+1)-0.047
=0.47×2-0.047
=0.94-0.047
=0.893
=0.47+0.47×(1-0.1)
=0.47+0.47×1-0.47×0.1
=0.47×(1+1)-0.047
=0.47×2-0.047
=0.94-0.047
=0.893
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