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a) \(\left(x-2\right)^3-\left(x+4\right)^2\)
\(=x^3-6x^2+12x-8-\left(x^2+8x+16\right)\)
\(=x^3-6x^2+12x-8-x^2-8x-16\)
\(=x^3-7x^2+4x-24\)
b) \(\left(x-3\right)^3+\left(x+3\right)^3\)
\(=x^3-9x^2+27x-27+x^3+9x^2+27x+27\)
\(=2x^3+54x\)
\(=2x\left(x^2+27\right)\)
c) \(\left(x-2\right)^2-\left(x+2\right)^2=\left(x^2-4x+4\right)-\left(x^2+4x+4\right)\)
\(=x^2-4x+4-x^2-4x-4=-8x\)
d) \(\frac{x^2-25}{x+5}=\frac{\left(x-5\right)\left(x+5\right)}{x+5}=x-5\)
e) \(\frac{x^3-6x^2+12x-8}{x-2}=\frac{\left(x-2\right)^3}{x-2}=\left(x-2\right)^2\)
g) \(\frac{x^3-125}{x-5}=\frac{x^3-5^3}{x-5}=\frac{\left(x-5\right)\left(x^2+5x+25\right)}{x-5}=x^2+5x+25\)
1)\(8x^6-\frac{1}{125}y^3=\left(2x^2\right)^3-\left(\frac{1}{5}y\right)^3\)
Bạn tự lm tiếp.AD HĐT số (7)
2)\(\left(x+4\right)^3-64=\left(x+4\right)^3-4^3\)
AD HĐT số (7).Tự lm tiếp
3)\(x^6+1=\left(x^2\right)^3+1\)
AD HĐT số (7).Tự lm tiếp
4)\(x^9+1=\left(x^3\right)^3+1\)
AD HĐT số (7).Tự lm tiếp
5,\(x^{12}-y^4=\left(x^6\right)^2-\left(y^2\right)^2\)
AD HĐT số (3).Tự lm tiếp
6)\(x^3+6x^2+12x+8=\left(x+2\right)^3\)
AD HĐT số (4)
7)\(x^3-15x^2+75x-125=\left(x-5\right)^3\)
AD HĐT số (5)
8)\(27a^3-54a^2b+36ab^2-8b^3\)
\(=\left(3a\right)^3-3.\left(3a\right)^2.2b+3.3a.\left(2b\right)^2-\left(2b\right)^3\)
\(=\left(3a-2b\right)^3\)
AD HĐT số (5)
\(S=1^3+2^3+3^3+...+n^3=\left(1+2+3+...+n\right)^2\)
\(=\left[\dfrac{n\left(n+1\right)}{2}\right]^2=\dfrac{n^2\cdot\left(n+1\right)^2}{4}\)
a) \(x^2-6x+9=\left(x-3\right)^2\)
b) \(x^2+8x+16=\left(x+4\right)^2\)
c) \(\left(x-3\right)^2-16=\left(x-3-4\right)\left(x-3+4\right)=\left(x-7\right)\left(x+1\right)\)
d) \(64+16x+x^2=\left(x+8\right)^2\)
e) \(x^2-x+\frac{1}{4}=\left(x-\frac{1}{2}\right)^2\)
f) mk chỉnh đề
\(8-36x+54x^2-27x^3=\left(2-3x\right)^3\)
g) \(8x^3+12x^2y+6xy^2+y^3=\left(2x+y\right)^3\)
\(a,\left(2x-3y\right)\left(4x^2+6xy+9y^2\right)=8x^3-27y^3\)
\(b,\left(x+3y\right)\left(x^2-3xy+9y^2\right)=x^3+27y^3\)
\(c,64-48x+12x^2-x^3=\left(4-x\right)^3\)
\(d,x^3+6x^2y+12xy^2+8y^3=\left(x+2y\right)^3\)
\(e,8x^3-60x^2y+150xy^2-125y^3=\left(2x-5y\right)^3\)
\(x^3-8+12x-6x^2\)
\(=x^3-3.x^2.2+3.x.2^2-2^3\)
\(=\left(x-2\right)^3\)