3又5/8-（-5/6)÷（-7/24)
=29/8-5/6x24/7
=29/8-20/7
=203/56-160/56
=43/56
(-81)÷2又1/4×4/9×（-1/16)
=81x4/9x4/9x1/16
=16x1/16
=1
-5÷（-0.2）×（-2/7)+|-1/7|
=-5÷0.2x2/7+1/7
=-25x2/7+1/7
=-50/7+1/7
=-49/7
=-7
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