rút gọn biểu thức
\(\left(\frac{x^3-3x}{x^2-9}\right):\left(\frac{9-x^2}{\left(x+3\right).\left(x+2\right)}+\frac{x-3}{x-2}-\frac{x+2}{x+3}\right)\)
a,\(\frac{\left(2x^3\right)}{4x^7}\)
b,\(\frac{\left(x-1\right)}{\left(x+1\right)^2}.\frac{x^2+2x+1}{x^2-1}\)
c,\(\frac{x^2-7x+12}{x^2-16}\)
d, \(\frac{x-1}{\sqrt{x+1}}:\left(\sqrt{x-1}\right)\)
Rút gọn phân thức
1/\(\frac{x^{3^{ }}-y^{3^{ }}+z^{3^{ }}+3xyz}{\left(x+y\right)^{2^{ }}+\left(y+z\right)^2+\left(z-x\right)^2}\)
2/\(\frac{x^{3^{ }}+y^{3^{ }}+z^3-3xyz}{\left(x-y\right)^2+\left(y-z\right)^2+\left(z-x\right)^2}\)
3/\(\frac{a^2\left(b-c\right)+b^2\left(c-a\right)+c^2\left(a-b\right)}{a^4\left(b^2-c^2\right)+b^4\left(c^2-a^3\right)+c^4\left(a^2-b^2\right)}\)
Tính giá trị của biểu thức:
\(\frac{\left(x-2\right)\left(2x+2x^2\right)}{\left(x+1\right)\left(4x-x^3\right)}\) vs x = -\(\frac{1}{2}\)
Bài 9. Rút gọn các phân thức sau
a) \(\frac{a^3+b^3+c^3-3abc}{a^2+b^2+c^2-ab-bc-ca}\)
d) \(\frac{a^2\left(b-c\right)+b^2\left(c-a\right)+c^2\left(a-b\right)}{a^4\left(b^2-c^2\right)+b^4\left(c^2-a^2\right)+c^4\left(a^2-b^2\right)}\)
e) \(\frac{a^2\left(b-c\right)+b^2\left(c-a\right)+c^2\left(a-b\right)}{ab^2-ac^2-b^3+bc^2}\)
f) \(\frac{x^{24}+x^{20}+x^{16}+...+x^4+1}{x^{26}+x^{24}+x^{22}+...+x^2+1}\)
Giải phương trình sau:
A=\(\left(\frac{2x}{x+3}+\frac{x}{x-3}+\frac{3x^{2^{ }}+3}{9-x^2}\right)-\left(\frac{x-1}{x-3}-\frac{1}{2}\right)\)
\(\frac{\left(x+1\right)\left(x+2\right)\left(x+3\right)\left(x+4\right)+4}{x^2+5x+4}\)
Rút gọn và tính giá trị của biểu thức
a) \(4x^2\left(5x-3y\right)-5x^2\left(4x+y\right)vớix=-2,y=-3\)
b)\(\left(x-4\right)\left(x-2\right)-\left(x-1\right)\left(x-3\right)vớix=\frac{7}{4}\)
CHO E=\(\left(\frac{x^3}{x^3-4x}+\frac{6}{6-3x}+\frac{1}{2+x}\right):\left(x+2+\frac{10-x^2}{x-2}\right)\)
a) Rut gon E
b) Tim x thuoc Z sao cho E thuoc Z