31÷47+(3/62×31-1/47)×31 如何算?

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31÷47+(3/62×31-1/47)×31 如何算?

31÷47+(3/62×31-1/47)×31
=31/47+3/2×31-31/47
=93/2

31÷47+(3/62×31-1/47)×31
=31×1/47+(3/2-1/47)×31
=31×1/47+3/2×31-1/47×31
=(31×1/47-1/47×31)+3/2×31
=0+93/2
=46.5