[-2/3+(-3/5)]÷[1+(-2/3)×(-3/5)] (1/3-1/2+5/6)-(1/2-5/6)
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[-2/3+(-3/5)]÷[1+(-2/3)×(-3/5)]
=(-10/15-9/15)÷(1+2/5)
=-19/15÷7/5
=-19/7
(1/3-1/2+5/6)-(1/2-5/6)
=1/3-1/2+5/6-1/2+5/6
=2/6-3/6+10/6-3/6
=6/6
=1
-17/18-(1/12-|2又3/4+5又1/3|)
=-17/18-1/12-▕2+9/12+5+4/12▏
=-34/36-3/36-7-13/12
=-37/36-7-39/36
=-7-74/36
=-9又18分之1
=(-10/15-9/15)÷(1+2/5)
=-19/15÷7/5
=-19/7
(1/3-1/2+5/6)-(1/2-5/6)
=1/3-1/2+5/6-1/2+5/6
=2/6-3/6+10/6-3/6
=6/6
=1
-17/18-(1/12-|2又3/4+5又1/3|)
=-17/18-1/12-▕2+9/12+5+4/12▏
=-34/36-3/36-7-13/12
=-37/36-7-39/36
=-7-74/36
=-9又18分之1
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