剛才說了,這個(gè)題目有問題
改一下吧
x^3y+3x-2x^2y^2-6y
=x³y-2x²y²+3x-6y
=x²y(x-2y)+3(x-2y)
=(x-2y)(x²y+3)恩恩、、謝謝親、、不過還有幾道題需要你解、、你最好了親1-m^2-n^2+2mnx^2-6x+9-y^22xy-x^2+1-y^24x^2-4xy+y^2-a^26xy+1-x^2-9y^2?????????????????????????????????1-m^2-n^2+2mn=1-(m²-2mn+n²)=1-(m-n)²=(1+m-n)(1-m+n) x^2-6x+9-y^2=(x-3)²-y²=(x-3+y)(x-3-y) 2xy-x^2+1-y^2=1-(x²-2xy+y²)=1-(x-y)²=(1+x-y)(1-x+y) 4x^2-4xy+y^2-a^2=(2x-y)²-a²=(2x-y+a)(2x-y-a) 6xy+1-x^2-9y^2=1-(x²-6xy+9y²)=1-(x-3y)²=(1+x-3y)(1-x+3y)