十三分之五×【一又五分之二+(6.5-二又三分之一÷一又三分之二)】
2013-01-25
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十三分之五×【一又五分之二+(6.5-二又三分之一÷一又三分之二)】
= 5/13×[7/5+(6.5-7/3÷5/3)]
=5/13×[7/5+(6.5-7/3×3/5)]
=5/13×[7/5+(6.5-7/5)]
=5/13×[7/5+6.5-7/5]
=5/13×6.5
=5/2
= 5/13×[7/5+(6.5-7/3÷5/3)]
=5/13×[7/5+(6.5-7/3×3/5)]
=5/13×[7/5+(6.5-7/5)]
=5/13×[7/5+6.5-7/5]
=5/13×6.5
=5/2
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