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简便计算:56/(5.6*4)第一道;8.4/9+1.6/4第二道;4.68-(1.68-0.32)第三道;7.3/4+

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简便计算:56/(5.6*4)第一道;8.4/9+1.6/4第二道;4.68-(1.68-0.32)第三道;7.3/4+2.7*0.25第四道
要算式~写的对的~+赏5~第二道抄错了~8.4/6+1.6/4
简便计算:56/(5.6*4)第一道;8.4/9+1.6/4第二道;4.68-(1.68-0.32)第三道;7.3/4+
56/(5.6*4)
=(56*10)/(5.6*4*10)
=(56*10)/(56*4)
=10/4=2.5
8.4/9+1.6/4
=8.4/9+0.4/1
=8.4/9+3.6/9
=12/9=4/3
4.68-(1.68-0.32)
=4.68-1.68+0.32
=3+0.32=3.32
7.3/4+2.7*0.25
=7.3/4+2.7*1/4
=7.3/4+2.7/4
=10/4
=2.5
再问: .怎么觉得有些题答案好像不对~
再答: 哪一个8.4/6+1.6/4 =1.4+0.4=1.8