25(X－Y)^2-16(X＋Y)^2
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25(X－Y)^2-16(X＋Y)^225(X－Y)^2-16(X＋Y)^225(X－Y)^2-16(X＋Y)^225(X－Y)^2-16(X＋Y)^2=5²(x-y)²-4
25(X－Y)^2-16(X＋Y)^2
25(X－Y)^2-16(X＋Y)^2
25(X－Y)^2-16(X＋Y)^2
25(X－Y)^2-16(X＋Y)^2
=5²(x-y)²-4²(x+y)²
=(5x-5y)²-(4x+4y)²
=(5x-5y+4x+4y)(5x-5y-4x-4y)
=(9x-y)(x-9y)
=9x^2+9y^2-82xy
=(x-9y)(9x-y)
25(X－Y)^2-16(X＋Y)^2
把(x+y),(x-y)个作为一个整体合并同类项1,7(x+y)-2(x+y)-4(x+y)+2(x+y)2,(x-y)²＋2(x-y)－(x-y)－2(x-y)²
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
y(x＋y)＋(x－y)²－x²－2y²
(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
9（x＋y)^2－(x－y)^2
(x－y)^2－10(y－x)+25
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