简便计算 [7-(1又3/4*5/9+1又3/4*4/9)]÷1.75

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简便计算 [7-(1又3/4*5/9+1又3/4*4/9)]÷1.75

简便计算 [7-(1又3/4*5/9+1又3/4*4/9)]÷1.75
简便计算 [7-(1又3/4*5/9+1又3/4*4/9)]÷1.75

简便计算 [7-(1又3/4*5/9+1又3/4*4/9)]÷1.75
[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

=〔7-(7/4×5/9+7/4*4/9)〕÷1.75
=〔7-7/4×(5/9+4/9)〕÷1.75
=(7-7/4)÷1.75
=(28/4-7/4)÷1.75
=21/4÷1.75
=21/4÷7/4
=21/4×4/7
=3