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x(x+1)+y(x+1)
(x+1)(x+y)
2. 2xy- 3x+ 4y^4 - 6y+9
x(2y-3)+(2y-3)^2
(2y-3)(x+2y-3)
3.
》3x^3+ 2x^2*y+ 3xy^2+ 2y^3- 15x^3*y- 10x^2* y^2
》x^2*(3x+ 2y)+ y^2(3x+ 2y)- 5x^2*y(3x+2y)
》(3x+2y)(x^2+y^2-5x^2*y)