简算0.4*(5/6+0.75)-2/5

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简算0.4*(5/6+0.75)-2/5简算0.4*(5/6+0.75)-2/5简算0.4*(5/6+0.75)-2/50.4*(5/6+0.75)-2/5=0.4*(5/6+0.75)-0.4=0.

简算0.4*(5/6+0.75)-2/5
简算0.4*(5/6+0.75)-2/5

简算0.4*(5/6+0.75)-2/5
0.4*(5/6+0.75)-2/5
=0.4*(5/6+0.75)-0.4
=0.4*(5/6+0.75-1)
=2/5*7/12
=7/30