因式分解 {[(5x+2y)²-(5x-2y)²]+(x-3y)²-（x²-16y²)(x-4y)÷(x+4y)}÷7y

因式分解 {[(5x+2y)²-(5x-2y)²]+(x-3y)²-（x²-16y²)(x-4y)÷(x+4y)}÷7y
因式分解 {[(5x+2y)²-(5x-2y)²]+(x-3y)²-（x²-16y²)(x-4y)÷(x+4y)}÷7y

因式分解 {[(5x+2y)²-(5x-2y)²]+(x-3y)²-（x²-16y²)(x-4y)÷(x+4y)}÷7y
{[(5x+2y)²-(5x-2y)²]+(x-3y)²-（x²-16y²)(x-4y)÷(x+4y)}÷7y
={[(5x+2y+5x-2y)(5x+2y-5x+2y)]+(x-3y)²-(x-4y)(x+4y)(x-4y)÷(x+4y)}÷7y
=[40xy+(x-3y)²-(x-4y)²]÷7y
=[40xy+x²-6xy+9y²-(x²-8xy+16y²)]÷7y
=(34xy+x²+9y²-x²+8xy-16y²)÷7y
=(42xy-7y²)÷7y
=6x-y
这中间用到了很多因式分解,但是从结果上看,像是在化简,而不是因式分解,请检查一下,

你抄错了吧