因式分解 81x^4-18x^2y^2+y^4

相关推荐

• 已知点A(―1,0),B(1,0)及抛物线y^2=2x ,若抛物线上点P满足向量|PA|=m|PB|,则m的最大值为64-4(1-m^2)(4-4m^2)≥0(m^2-3)(m^2+1)≤0这两步之间不太明白..设P点(y^2/2,y)|PA|^2=(y^2/2+1)^2+y^2|PB|^2=(y^2/2-1)^2+y^2|PA|^2=m^2|PB|^2 （m≥0）(y^2/2+1)^2+y^2=m^2(y^2/2-1)^2+m^2y^2(1-m^2)y^4+8y^2+4-4m^2=0设y^2=p≥0(1-m^2)p^2+8p+4-4m^2=0则△≥064-4(1-m^2)(4-4m^2)≥0(m^2-3)(m^2+1)≤0m∈[-√3,√3]由p≥0p1+p2≥0，p1*p2≥0得8/(m^2-1)≥0m∈(-∞，-1]∪[1,+∞)4m^2/(m^2-1)≥0m∈(-∞，-1]∪[1,+∞)交集为m∈[-√3，-1]∪[1,√3]最大值为√3
• 因式分解的几个问题 a²-9b²+2a-6b x²+x-4y²-2y
• 因式分解3x^2y^3-6xy^4+12xy
• 因式分解(x^2+y^2)^2-4x^2y^2-4a^2
• 因式分解①16x^2y^2-9 ②-24x^2y-12xy^2+28^3 ③（2a+x）^2-（a-x）^2 ④-4x+1+4x^2 ⑤2xy-y^2-x^2
• 因式分解－1／4x＾3＋x＾2y－x＾2y
• 因式分解 (1) ax^4-81a (2) 4x^2(x-y)+2x(x-y) (3) a^2x^2+4a^2xy+4a^2y^2
• 因式分解2(x^2y^2+y^2z^2+z^2x^2)-(x^4+y^4+z^4)
• 因式分解：x^4-2x^4y+x^4y^2-2x^2+y^2-2x^2y^2+2y+1
• X^2+Y^2+X^2Y^2-4XY+1=0,求(X-Y)^2008-(XY)^2008的值
• it was so quiet in the classroom that a needle—-————to drop onto the floor
• 幼儿园买来一批玩具,其中60%按2：3分给中班和大班,还剩下100个分给小班.大班分得多少个玩具