已知m²-m-3=0,求m³+999m²-1003m-991的值请快,超过9点失效!

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已知m²-m-3=0,求m³+999m²-1003m-991的值请快,超过9点失效!
……= =哪个对的哦？

m²-m-3=0
m²-m=3
m³+999m²-1003m-991
=m³-m²+1000m²-1003m-991
=m(m²-m)+1000m²-1003m-991
=3m+1000m²-1003m-991
=1003m²-1003m-991
=1003*(m²-m)-991
=1003*3-991
=3009-991
=2018

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