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解：
原式=15m²-9+4m²-5m+8m²+2m²-m+3m
=15m²+4m²+8m²+2m²-5m-m+3m-9
=29m²-3m-9
=29/4-3/2-9
=29/4-21/2
=-13/4
原式=15m²-9+4m²-5m+8m²+2m²-m+3m
=15m²+4m²+8m²+2m²-5m-m+3m-9
=29m²-3m-9
=29/4-3/2-9
=29/4-21/2
=-13/4
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