因式分解 ab²-a 3χ³-18χy+27χy² a³-8α
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因式分解 ab²-a 3χ³-18χy+27χy² a³-8α
因式分解 ab²-a 3χ³-18χy+27χy² a³-8α
因式分解 ab²-a 3χ³-18χy+27χy² a³-8α
ab²-a
=a(b²-1)
=a(b+1)(b-1)
3χ³-18χy+27χy²
=3x(x²-6xy+9y²)
=3x(x-3y)²
a³-8α
=a(a²-8)
=a(a+2√2)(a-2√2)
ab²-a =a(b^2-1)=a(b-1)(b+1)
3χ³-18χ【^2】y+27χy² =3x(χ²-6χy+9y²)=3x(x-3y)^2
a³-8α=a(a^2-8)=a(a-2√2)((a+2√2)