原式=(9m²-9n²)-(9m²+18mn+9n²)+(9m²-18mn+9n²)=9m²-9n²-9m²-18mn-9n²+9m²-18mn+9n²=-9m²-36mn-9n²
计算：(3m+3n)(3m-3n)-(3m+3n)^2+（3m-2n)^2
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