1.6y^2-11y-102.5x^5-15x^3y-20xy^2

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1.6y^2-11y-102.5x^5-15x^3y-20xy^2

1.6y^2-11y-102.5x^5-15x^3y-20xy^2
1.6y^2-11y-10
2.5x^5-15x^3y-20xy^2

1.6y^2-11y-102.5x^5-15x^3y-20xy^2
6y^2-11y-10
=(2y-5)(3y+2)
5x^5-15x^3y-20xy^2
=5x(x^4-3x^2y-4y^2)
=5x(x^2+y)(x^2-4y)

1.(3y-2)(2y-5)

1. 6y^2-11y-10
＝（3Y+2）(2Y-5)
2. 5x^5-15x^3y-20xy^2=5X(X^2-4Y)(X^2+Y)

1. 6y^2-11y-10
=(2y-5)(3y+2)
2. 5x^5-15x^3y-20xy^2
=5x(x^4-3x^2y-4y^2)
=5x(x^2-4y)(x^2+y)

十字相乘法：
1. 6y^2-11y-10
2y -5
3y +2
-------
-15y+4y = -11y
所以 6y^2-11y-10 = (2y-5) (3y-2）.
2. 5x^5-15x^3y-20xy^2
= x(5x^4-15x^2y-20y^2)
5x^2 +5y
x^2 -4y
----------
5x^2y -20x^2y = -15x^2y
所以 5x^5-15x^3y-20xy^2 = x(5x^2+5y)(x^2-4y).

1.6y^2-11y-102.5x^5-15x^3y-20xy^2 4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11 3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27 5x(x-y)+2y(x-y) 化简:5(x-y)+2(x+y)-3(x-y) 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) x+2y=5x-6y=11 3*X=Y X/2=Y/5+11 {2x+y=74x+5y=11 2x+4y-5x-y+12-11frgbnihai （X+2Y)(5X-2Y) (x+2y)(5x-2y) 4x+2y-5x-y (2x-3y)-(5x-y) (2X-3y)-(5x-y) (x-y)^2+5(x-y)-14 (2x-5y)(3x+y) 因式分解(x-2y)(x-3y)+(x-4y)(x-5y)+（x-3y)(x-5y)+(x-2y)(x-4y)