(3m²n)²×(-2m²)^4×(-n²)^ 5
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(3m²n)²×(-2m²)^4×(-n²)^ 5
(3m²n)²×(-2m²)^4×(-n²)^ 5
(3m²n)²×(-2m²)^4×(-n²)^ 5
(3m²n﹚²·﹙﹣2m²﹚^4·﹙﹣n²﹚^5
=-9m^4n^2x16m^8xn^10
=-144m^12 n^12