整式的乘除法应用题,
(1)(x-y)(x+y)(x²+y²)
(2)(2x-3)²(2x+3)(2x-3)
(3)(6m²n-6m²n²-3m²)÷(-3m²)
(4)(5a²b-3ab-1)(-3a²)
(5)(-3x²y)³(-2xy³z)²