a-²b-³*(-3a-1次方b-²)÷6a-4次方b-²
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a-²b-³*(-3a-1次方b-²)÷6a-4次方b-²
a-²b-³*(-3a-1次方b-²)÷6a-4次方b-²
a-²b-³*(-3a-1次方b-²)÷6a-4次方b-²
1/a²b³×(-3/ab²)×a的4次方b²/6
=-a/2b³