作业帮(7m²-4mn-n²)-(3m²-mn+2n²)求解
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(7m²-4mn-n²)-(3m²-mn+2n²)求解
(7m²-4mn-n²)-(3m²-mn+2n²)求解
(7m²-4mn-n²)-(3m²-mn+2n²)求解
(7m²-4mn-n²)-(3m²-mn+2n²)
=(7m²-4mn-n²)-3m²+mn-2n²
=4m²-3mn-3n²
=4m^2-3mn-3n^2