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\(A=\left(a+3\right)^2\left(a^2-3a+9\right)-\left(a-3\right)\left(a^2+3a+9\right)\)
\(A=\left(a^3+3^3\right)-\left(a^3-3^3\right)\)
\(A=a^3+3^3-a^3+3^3\)
\(A=3^3+3^3=54\)
\(A=9+3a+3a^2+a^3\)
\(=\left(a+3\right)^3-18\)
\(=3,5^3-18=24,875\)
\(\left(x-1\right)-\left(x-2\right)\left(x+2\right)\)
\(=\left(x-1\right)-\left(x^2-2^2\right)\)
\(=\left(x-1\right)-x^2+2^2\)
\(=x-1-x^2+2^2\)
\(=x-x^2+\left(2-1\right)\left(2+1\right)\)
\(=x-x^2+3\)
a/ (x-1)2-(x-2)(x+2)
=(x-1)-(x2-22)
=(x-1)-x2-22
=x-x2 +(2-1)(2+1)
=x-x2+3
(a4 - 3a2 + 9).(a2 + 3) - (3 + a2)3
= a6 + 27 - 27 - 9a4 - 27a2 - a6
= -9a4 - 27a2
\(\left(\dfrac{a-3}{a}-\dfrac{a}{a-3}+\dfrac{9}{a^2-3a}\right):\dfrac{2a+2}{a}=\left(\dfrac{a-3}{a}-\dfrac{a}{a-3}+\dfrac{9}{a\left(a-3\right)}\right):\dfrac{2a+2}{a}=\left(\dfrac{a^2-6a+9}{a\left(a-3\right)}-\dfrac{a^2}{a\left(a-3\right)}+\dfrac{9}{a\left(a-3\right)}\right):\dfrac{2a+2}{a}=\left(\dfrac{a^2-6a+9-a^2+9}{a\left(a-3\right)}\right):\dfrac{2a+2}{a}=\dfrac{18-6a}{a\left(a-3\right)}:\dfrac{2a+2}{a}=\dfrac{6a-18}{\left(-a\right)\left(3-a\right)}:\dfrac{2a+2}{a}=\dfrac{6}{\left(-a\right)}:\dfrac{2a+2}{a}=\dfrac{6a}{\left(-2a^2\right)+\left(-2a\right)}.DKXD:a\ne0;a\ne3\)
1: =(4x-1)^2-3(4x-1)
=(4x-1)(4x-1-3)
=4(x-1)(4x-1)
2: =-8x^4y^5(2y+3x)
3: =(a-5)^2-4b^2
=(a-5-2b)(a-5+2b)
5: =x^2-mx-nx+mn
=x(x-m)-n(x-m)
=(x-m)(x-n)
6: =(4a^2-3a-18-4a^2-3a)(4a^2-3a-18+4a^2+3a)
=(-6a-18)(8a^2-18)
=-6(2a-3)(2x+3)(a+3)
thank thi kike cho mình nha
\(\left(a+3\right)\left(a^2-3a+9\right)-\left(a-3\right)\left(a^2+3a+9\right)\)
\(=a^3+27-\left(a^3-27\right)\)
\(=a^3+27-a^3+27\)
\(=54\)