-16(2x+y)^2+25(x-2y)^24m^3-9mn^218(a-b)^3-8(a+2b)^2(a-b)

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-16(2x+y)^2+25(x-2y)^24m^3-9mn^218(a-b)^3-8(a+2b)^2(a-b)-16(2x+y)^2+25(x-2y)^24m^3-9mn^218(a-b)^3-8(

-16(2x+y)^2+25(x-2y)^24m^3-9mn^218(a-b)^3-8(a+2b)^2(a-b)
-16(2x+y)^2+25(x-2y)^2
4m^3-9mn^2
18(a-b)^3-8(a+2b)^2(a-b)

-16(2x+y)^2+25(x-2y)^24m^3-9mn^218(a-b)^3-8(a+2b)^2(a-b)
第一题：原式=25(x-2y)^2-16(2x+y)^2
=（5x-10y)^2-(8x+4y)^2
=(5x-10y+8x+4y)(5x-10y-8x-4y)
后面自己做啦.
第二题：原式=m(4m^2-9n^2)
=m(2m+3n)(2m-3n)
第三题：提出公因式2（a-b）后,得
2（a-b)[3(a-b)-2(a+2b)][3(a-b)+2(a+2b)]
后面自己做哦.

x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 化简y(x+y)+(x+y)(x-y)-x^2 (12-2x)/X=(-16-2Y)/Y X^2+Y^2=25 Y (x+y)(x-y)-(x-y)^2如题 (x+y)(x-y)-(x-y)^2 (x+y)^2-16(x-y)^2 (x+y)^2-16(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) 16-8（x-y)+(x-y)2 因式分解x(x+y)(x-y)-x(x+y)^2 [(x-y)^2-(x+2y)(x-2y)]/y 计算:y-x分之x+y+x-y分之y-y-x分之2x-y x^2(x-y)+(y-x) x(x-y)2-(y-x)3 【(x-y)^2+(x+y)(x-y)】除以 2x [(x-y)²+(x+y)(x-y)]除以2x 25(2x+y)^2-16(x-2y)^2 (x-6y)(x+2y)+16y^2 因式分解 （16x^4+y^4)(4x^2+y^2)(2x-y)(2x+y)