几道数学简算题5.3+2.55/1.7(70+0.42)/74.2/28

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几道数学简算题5.3+2.55/1.7(70+0.42)/74.2/28

几道数学简算题5.3+2.55/1.7(70+0.42)/74.2/28
几道数学简算题
5.3+2.55/1.7
(70+0.42)/7
4.2/28

几道数学简算题5.3+2.55/1.7(70+0.42)/74.2/28
5.3+2.55/1.7=5.3+1.5=6.8
(70+0.42)/7=70.42/7=10.06
4.2/28=0.15

5.3+2.55/1.7
=6401/170
(70+0.42)/7
=10.06
4.2/28
=0.15

70.42