(12m三次方-6m²+4m)÷(-2m)
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(12m三次方-6m²+4m)÷(-2m)
(12m³-6m²+4m)÷(-2m)
=(12m³)÷(-2m)-6m²)÷(-2m)+4m÷(-2m)
=-6m²+3m-2
(12m三次方-6m²+4m)÷(-2m)
(12m³-6m²+4m)÷(-2m)
=(12m³)÷(-2m)-6m²)÷(-2m)+4m÷(-2m)
=-6m²+3m-2