九分之八减中括号四分之三减小括号十六分之七减四分之一樊小阔号咱中国好

2024-10-29 12:23:34
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8/9-[3/4-(7/16-1/4)]
=8/9-[3/4-7/16+1/4)
=8/9-[(3/4+1/4)-7/16]
=8/9-[1-7/16]
=8/9-9/16
=128/144-81/144
=47/144

1/13+12/13×(5/2-1/3)
=1/13+12/13×5/2-12/13×1/3
=1/13+30/13-4/13
=27/13