因式分解数道1.x^2-y^2+6x+92.x^3-x^2+x-13.x^2-2x-y^2+14.1/5ab -1/15
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因式分解数道
1.x^2-y^2+6x+9
2.x^3-x^2+x-1
3.x^2-2x-y^2+1
4.1/5ab -1/15ac+3b^2-bc
5.18a^2-32b^2-18a+24b
6.x^2-25+y^2-2xy
1.x^2-y^2+6x+9
2.x^3-x^2+x-1
3.x^2-2x-y^2+1
4.1/5ab -1/15ac+3b^2-bc
5.18a^2-32b^2-18a+24b
6.x^2-25+y^2-2xy
1,x^2-y^2+6x+9=(x+3)²-y²=(x+3-y)(x+3+y)
2.x^3-x^2+x-1=x²(x-1)+(x-1)=(x²+1 )(x-1)
3.x^2-2x-y^2+1=(x-1)²-y²=(x-1+y)(x-1-y)
4.1/5ab -1/15ac+3b^2-bc=1/15 a(3b-c)+b(3b-c)=(1/15 a+b)(3b-c)
5.18a^2-32b^2-18a+24b=
6,x^2-25+y^2-2xy=(x-y)²-25=(x-y+5)(x-y-5)
2.x^3-x^2+x-1=x²(x-1)+(x-1)=(x²+1 )(x-1)
3.x^2-2x-y^2+1=(x-1)²-y²=(x-1+y)(x-1-y)
4.1/5ab -1/15ac+3b^2-bc=1/15 a(3b-c)+b(3b-c)=(1/15 a+b)(3b-c)
5.18a^2-32b^2-18a+24b=
6,x^2-25+y^2-2xy=(x-y)²-25=(x-y+5)(x-y-5)
因式分解数道1.x^2-y^2+6x+92.x^3-x^2+x-13.x^2-2x-y^2+14.1/5ab -1/15
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