题目抄写错误?如果题目是[(3x+2y)(3x-2y)-(5x+2y)(5x-2y)]÷（4x）={(3x)²-(2y)²-[(5x)²-(2y)²]}÷（4x）=(9x²-4y²-25x²+4y²)÷（4x）=(-16x²)÷（4x）=-4x [(3x+2y)(...