合并同类项:(1)½mn-4mn+3mn(2)a³-2a²+3a-6-4a³+2a²+2a+2

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合并同类项:(1)½mn-4mn+3mn(2)a³-2a²+3a-6-4a³+2a²+2a+2
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合并同类项:(1)½mn-4mn+3mn(2)a³-2a²+3a-6-4a³+2a²+2a+2
合并同类项:(1)½mn-4mn+3mn(2)a³-2a²+3a-6-4a³+2a²+2a+2

合并同类项:(1)½mn-4mn+3mn(2)a³-2a²+3a-6-4a³+2a²+2a+2
(1)½mn-4mn+3mn=½mn-mn=-½mn
(2) a³-2a²+3a-6-4a³+2a²+2a+2
=a³-4a³-2a²+2a²+3a+2a-6+2
=-3a³+5a-4