1,若x不等于0是x^2+xy+y^2=0,则(x^2+3xy+y^2)/(x^2+y^2)=?
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1,若x不等于0是x^2+xy+y^2=0,则(x^2+3xy+y^2)/(x^2+y^2)=?
2.因式分解:4x^4-13x^2+9
3.因式分解:(x^2-2x)^2-7(x^2-2z)+12
2.因式分解:4x^4-13x^2+9
3.因式分解:(x^2-2x)^2-7(x^2-2z)+12
1,
x^2+xy+y^2=0 则
x^2+3xy+y^2
=(x^2+xy+y^2)+2xy
=0+2xy
=2xy
x^2+y^2
=(x^2+xy+y^2)-xy
=0-xy
=-xy
则
(x^2+3xy+y^2)/(x^2+y^2)
=2xy/-xy
=-2
-----------------------------
2,
4x^4-13x^2+9
=(x^2-1)(4x^2-9)
=(x-1)(x+1)(2x-3)(2x+3)
--------------------------
3,(楼主:z应改成x)
(x^2-2x)^2-7(x^2-2x)+12
=(x^2-2x-4)(x^2-2x-3)
=(x^2-2x-4)(x-3)(x+1)
x^2+xy+y^2=0 则
x^2+3xy+y^2
=(x^2+xy+y^2)+2xy
=0+2xy
=2xy
x^2+y^2
=(x^2+xy+y^2)-xy
=0-xy
=-xy
则
(x^2+3xy+y^2)/(x^2+y^2)
=2xy/-xy
=-2
-----------------------------
2,
4x^4-13x^2+9
=(x^2-1)(4x^2-9)
=(x-1)(x+1)(2x-3)(2x+3)
--------------------------
3,(楼主:z应改成x)
(x^2-2x)^2-7(x^2-2x)+12
=(x^2-2x-4)(x^2-2x-3)
=(x^2-2x-4)(x-3)(x+1)
若3x^2+3xy=0且xy不等于0,则x:y=
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