(14m²-7m²+m)÷(-7m)化简给过程照片即可.

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(14m²-7m²+m)÷(-7m)化简给过程照片即可.(14m²-7m²+m)÷(-7m)化简给过程照片即可.(14m²-7m²+m)÷(

(14m²-7m²+m)÷(-7m)化简给过程照片即可.
(14m²-7m²+m)÷(-7m)化简给过程照片即可.

(14m²-7m²+m)÷(-7m)化简给过程照片即可.
原式 = -(7m²+m)/(7m)
=-(7m²/7m)- m/7m
=-m -1/7