作业帮16m－m³ --------- = m²﹢m－20
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16m－m³ --------- = m²﹢m－20
16m－m³ --------- = m²﹢m－20
16m－m³ --------- = m²﹢m－20
16m-m³
=-m(m²-16)
=-m(m+4)(m-4)
m²+m-20
=m²+5m-4m-20
=m(m+5)-4(m+5)
=(m+5)(m-4)