3m²n+5mn²+6nm²-4n²m-n²m(合并同类项)(1)3m²n+5mn²+6nm²-4n²m-n²m(2)2/3a²-6a³+5a-1/4+5a³-1/2-4/3a²快
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3m²n+5mn²+6nm²-4n²m-n²m(合并同类项)(1)3m²n+5mn²+6nm²-4n²m-n&
3m²n+5mn²+6nm²-4n²m-n²m(合并同类项)(1)3m²n+5mn²+6nm²-4n²m-n²m(2)2/3a²-6a³+5a-1/4+5a³-1/2-4/3a²快
3m²n+5mn²+6nm²-4n²m-n²m(合并同类项)
(1)3m²n+5mn²+6nm²-4n²m-n²m
(2)2/3a²-6a³+5a-1/4+5a³-1/2-4/3a²
快
3m²n+5mn²+6nm²-4n²m-n²m(合并同类项)(1)3m²n+5mn²+6nm²-4n²m-n²m(2)2/3a²-6a³+5a-1/4+5a³-1/2-4/3a²快
(1)3m²n+5mn²+6nm²-4n²m-n²m
=(3m²n+6nm²)+(5mn²-4n²m-n²m)
=9m²n
(2)2/3a²-6a³+5a-1/4+5a³-1/2-4/3a²
=(2/3a²-4/3a²)-(6a³-5a³)+5a-(1/4+1/2)
=-2/3a²-a³+5a-3/4