78.78÷13-19的简便计算、(1/5+2/7)×14+1/5的简便计算急~~~~

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78.78÷13-19的简便计算、(1/5+2/7)×14+1/5的简便计算急~~~~78.78÷13-19的简便计算、(1/5+2/7)×14+1/5的简便计算急~~~~78.78÷13-19的简便

78.78÷13-19的简便计算、(1/5+2/7)×14+1/5的简便计算急~~~~
78.78÷13-19的简便计算、(1/5+2/7)×14+1/5的简便计算
急~~~~

78.78÷13-19的简便计算、(1/5+2/7)×14+1/5的简便计算急~~~~
78.78÷13-19=6.06-19=12.94