是关于化简的 70 4m²-4(3m²-3mn-2n²)+6-3n²1/3a-(1/2a-4b+6a)+3(-2a+2b)
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是关于化简的 70 4m²-4(3m²-3mn-2n²)+6-3n²1/3a-(1/2a-4b+6a)+3(-2a+2b)
是关于化简的 70
4m²-4(3m²-3mn-2n²)+6-3n²
1/3a-(1/2a-4b+6a)+3(-2a+2b)
是关于化简的 70 4m²-4(3m²-3mn-2n²)+6-3n²1/3a-(1/2a-4b+6a)+3(-2a+2b)
-8m²+12mn+5n²
-1/6a-4b-12a
原式=4m^2-12m^2+12mn+8n^2+6-3n^2 =-8m^2+5n^2+12mn+6 2.是1/3*a还是1/(3a)
4m²-4(3m²-3mn-2n²)+6-3n²
=4m²-12m²+12mn+8n²+6-3n²
=5n²-8m²+12mn+6