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0.271×342+0.657×271+2.71×0.1简便计算?
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0.271x342+0.657×271+2.71×0.1
=271×0.342+0.657×271+271×0.001
=271(0.342+0.657+0.001)
=271×1
=271
=271×0.342+0.657×271+271×0.001
=271(0.342+0.657+0.001)
=271×1
=271
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