解:(2x-3y)的2次方*(2x+3y)的2次方=[(2x-3y)(2x+3y)]²=(4x²-9y²)²=16x^4-72x²y²+81y^4
(2x-3y)的2次方*(2x+3y)的2次方=【(2x-3y)*(2x+3y)】^2=(4x^2-9y^2)^2=16x^4-72x^2y^2+81y^4
(2x-3y)^2*(2x+3y)^2=[(2x-3y)*(2x+3y)]^2=(4x^2-9y^2)^2=16x^4-72x^2y^2+81y^4