整式的乘除「(3x+2y)(3x-2y)-(x+2y)(5x-2y)」÷(4x)如何计算

问题描述:

整式的乘除
「(3x+2y)(3x-2y)-(x+2y)(5x-2y)」÷(4x)
如何计算

[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]÷(4x)
=[(3x)²-(2y)²-(5x²-2xy+10xy-4y²)]÷(4x)
=(9x²-4y²-5x²-8xy+4y²)÷(4x)
=(4x²-8xy)÷(4x)
=x-2y

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)(...