1. 5/6*(-6/7)=-5/7
2.-5/7-2/7=-7/7= -1
3.(-1):0.1=-10
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1. 2 7/10+3/5=2 7/10+6/10=2 13/10=3 3/10=3.3
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38:2 1/9=38:19/9=38*9/19=2*9=18
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3³=27
27*5/18=3*5/2=15/2=7 1/2=7.5
7.5:10²=7.5:100=0.075