16(x-y)的平方-9(x+y)的平方=(______)*(________)

问题描述:

16(x-y)的平方-9(x+y)的平方=(______)*(________)

16(x-y)²-9(x+y)²
=[4(x-y)]²-[3(x+y)]²
=(4x-4y+3x+3y)(4x-4y-3x-3y)
=(7x-y)(x-7y)