1、x^2y-6xy^2+9y^22、(y^2+4^2)-16y^23、(a-b)m^2+(b-a)n^24、x^3-2x[2分之1x^2-3)(6分之1x-1)-4分之1x]5、(a+1)^2-(1-a)(-a-1)6、[(2xy+3)(2xy-3)+(xy+3^2)]÷xy
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1、x^2y-6xy^2+9y^2
2、(y^2+4^2)-16y^2
3、(a-b)m^2+(b-a)n^2
4、x^3-2x[2分之1x^2-3)(6分之1x-1)-4分之1x]
5、(a+1)^2-(1-a)(-a-1)
6、[(2xy+3)(2xy-3)+(xy+3^2)]÷xy
1、x^2y-6xy^2+9y^2
=y(x²-6xy+9y)
2、(y^2+4)^2-16y^2
=(y²+4-4y)(y+4+4y)
=(y-2)²(y+2)²
3、(a-b)m^2+(b-a)n^2
=(a-b)m²-(a-b)n²
=(a-b)(m²-n²)
=(a-b)(m+n)(m-n)
4、x^3-2x[2分之1x^2-3)(6分之1x-1)-4分之1x]
看不太清楚
5、(a+1)^2-(1-a)(-a-1)
=(a+1)²-(a-1)(a+1)
=(a+1)(a+1-a+1)
=2(a+1)
6、[(2xy+3)(2xy-3)+(xy+3^2)]÷xy
=(4x²y²-9+xy+9)÷xy
=(4x²y²+xy)÷xy
=4xy+1
因式分解吗?好乱!
化简:x-y/x+3y÷x^-y^2/x^2+6xy+9y^2-(xy/x+y)
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