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a)-4a^3b.2a^3b^2-4a^3b(-3ab^4)
-8a^6b^3+12a^4b^3
b)2x.x^2-2x.3x+2x.4-3.x^2-3.(-3x)-3.4
2x^3-6x^2+8x-3x^2+9x-12
2x^3-9x^2+17x-12
\(a^7-a^5+2a^3+2a^2\\ =a^5\left(a^2-1\right)+2a^2\left(a+1\right)\\ =a^5\left(a-1\right)\left(a+1\right)+2a^2\left(a+1\right)\\ =a^2\left(a+1\right)\left(a^4-a^3+2\right)\)
\(\left(2a+3\right)\left(2a+3\right)y+\left(2a+3\right)\)
\(=\left(2a+3\right)[y\left(2a+3\right)+1]\)
\(=\left(2a+3\right)\left(2ay+3y+1\right)\)
\(\left(a-b\right)x+\left(b-a\right)y-\left(a-b\right)\) (Sửa đề)
\(=\left(a-b\right)x-\left(a-b\right)y-\left(a-b\right)\)
\(=\left(a-b\right)\left(x-y-1\right)\)
1:
a: \(\left(x+y+z\right)^2=x^2+y^2+z^2+2xy+2zx+2yz\)
b: \(\left(x-y+z\right)^2=x^2+y^2+z^2-2xy+2xz-2yz\)
c: \(\left(x-y-z\right)^2=x^2+y^2+z^2-2xy-2xz+2yz\)
1) \(2xy^3-6x^2+10xy\)
\(=2x.y^3-2x.3x+2x.5y\)
\(=2x\left(y^3-3x+5y\right)\)
\(=2x[y\left(y^2-5\right)-3x]\)
a) 4(2x-3)^2-9(4x^2-9)^2
=[2(2x-3)]^2-[3(4x^2-9)]^2
=(4x-6)^2-(12x^2-27)^2
=(4x-6+12x^2-27)(4x-6-12x^2+27)
=(12x^2+4x-33)(4x-12x^2+21)
b) a^6-a^4+2a^3+2a^2
=a^4(a^2-1)+2a^2(a+1)
=a^4(a+1)(a-1)+2a^2(a+1)
=(a+1)[(a^4)(a-1)+2a^2]
=(a+1)(a^5+a^4+2a^2)