简便计算 [7-(1又3/4*5/9+1又3/4* - 知识问答

简便计算 [7-(1又3/4*5/9+1又3/4*4/9)]÷1.75

2个回答

[7-(1又3/4*5/9+1又3/4*4/9)]÷1.75
=[7-1又3/4*(5/9+4/9)]÷1.75
=[7-1又3/4*1]÷1.75
=[7-1又3/4]÷1.75
=21/4÷7/4
=3

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