(2m+3n)²(3n-2m)²
=(9n²-4m²)²
=81n的4次方-72m²n²+16m的4次方
4(a+2)²-7(a+3)(a-3)+3(a-1)²
=4a²+16a+16-7a²+63+3a²-6a+3
=10a+82
如果本题有什么不明白可以追问,
(2m+3n)²(3n-2m)²
=(9n²-4m²)²
=81n的4次方-72m²n²+16m的4次方
4(a+2)²-7(a+3)(a-3)+3(a-1)²
=4a²+16a+16-7a²+63+3a²-6a+3
=10a+82
如果本题有什么不明白可以追问,