用简便方法计算:2/15×4.69+3.21×152/15+7.9÷15/13我感激不尽.

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用简便方法计算:2/15×4.69+3.21×152/15+7.9÷15/13我感激不尽.
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用简便方法计算:2/15×4.69+3.21×152/15+7.9÷15/13我感激不尽.
用简便方法计算:2/15×4.69+3.21×152/15+7.9÷15/13
我感激不尽.

用简便方法计算:2/15×4.69+3.21×152/15+7.9÷15/13我感激不尽.
原式=(2×(4.69+3.21)+150*3.21+7.9*13)/15
=(2*7.9+150*3.21+7.9*13)/15
=(15*7.9+150*3.21)/15
=7.9+32.1
=40