bài 1 :rút gọn

a, (3x-1)(9x²+3x+1)=27x³-1

b, (x²-5x+25)(x+5)=x³+125

c, (x-3)(x²-6x+9)=(x-3)³

d, (x-y+4)(x+y-4)

e, x³y⁵(2xy³-y⁷)-y⁷(-x³y⁵+2)

thực hiện phép tính

a, x^5.y³.\((\)x²-y⁶\()\)-y⁵x\((\)x³-y⁴-6x⁵y⁹-x⁴y⁵\()\)

b, a²\((b^{2^{ }}-a^2)+b^2(b^2+a^2)\)

tìm x

a.\(\frac{3}{5}-\frac{x}{4}=\frac{7}{2}\)

b,\(\frac{x-5}{4}-\frac{3}{5}=\frac{1}{2}\)

c,\(1-\frac{8}{x}=\frac{-3}{5}\)

d,\(\frac{4}{3}=\frac{8-x}{2x+3}\)

tìm x,

a, \(2(x-3)-5\times(2x-4)=0\)

b,\(3+\frac{1}{x-8}=0\)

c,\(\frac{8}{3}-\frac{2x+3}{5}=-\frac{-7}{3}\)

d,\(\frac{1}{9}=\frac{5}{3x-5}=0\)

rút gọn

a,\(\frac{8x^2y^3}{4xy^5}\)

b, \(\frac{-2(x^2y)^6}{(y^6x)^2}\)

c,\(\frac{(x+1)^2}{(x-1)\times(x+1)}\)