16(x-y)^2-25(x+y)^2

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16(x-y)^2-25(x+y)^216(x-y)^2-25(x+y)^216(x-y)^2-25(x+y)^2=[4(x-y)]^2-[5(x+y)]^2=(4x-4y)^2-(5x+5y)^2=

16(x-y)^2-25(x+y)^2
16(x-y)^2-25(x+y)^2

16(x-y)^2-25(x+y)^2
=[4(x-y)]^2-[5(x+y)]^2
=(4x-4y)^2-(5x+5y)^2
=(4x-4y+5x+5y)(4x-4y-5x-5y)
=(9x+y)(-x-9y)
=-(9x+y)(x+9y)

16(x-y)^2-25(x+y)^2
=[4(x-y)+5(x+y)][4(x-y)-5(x+y)]
=(9x+y)(-x-9y)
=-(9x+y)(x+9y)

x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 (12-2x)/X=(-16-2Y)/Y X^2+Y^2=25 Y 化简y(x+y)+(x+y)(x-y)-x^2 (x+y)^2-16(x-y)^2 (x+y)^2-16(x-y)^2 16-8（x-y)+(x-y)2 (x+y)(x-y)-(x-y)^2如题 (x+y)(x-y)-(x-y)^2 【2(x-y)(x-y)(x-y)-8(x-y)(x-y)(x+y)+6y(x-y)(x-y)]/2(x-y)(x-y) 因式分解x(x+y)(x-y)-x(x+y)^2 25(2x+y)^2-16(x-2y)^2 因式分解16(x+y)^2-25(x-y)^2 25(y-x)^2-16(x+y)^2因式分解 16(x-y)^2-25(x+y)^2 16（x+y）^2-25（x-y）^2 25(X－Y)^2-16(X＋Y)^2 分解因式25(x+y)^2-16(x-y)^2 25(X+Y)^2-16(X-Y)^2 分解因式：16(x+y)^2-25(x-y)^2