[(3x+y)²-(3x-y)²]÷(4x-2y)计算 怎么做?求解.

[(3x+y)²-(3x-y)²]÷(4x-2y)计算 怎么做?求解.
[(3x+y)²-(3x-y)²]÷(4x-2y)计算 怎么做?
求解.

[(3x+y)²-(3x-y)²]÷(4x-2y)计算 怎么做?求解.
原式=(3x+y+3x-y)(3x+y-3x+y)÷2(2x-y)
=12xy÷2(2x-y)
=6xy/(2x-y)