\(\left(x+2\right)^3-x\left(x-3\right)\left(x+3\right)-6x^2=29\)
\(\Leftrightarrow x^3+6x^2+12x+8-x^3+9x-6x^2=29\)
\(\Leftrightarrow21x=21\)
\(\Leftrightarrow x=1\)
Tinhs
a)\(\left(2a-b\right).\left(4a^2+4ab+b^2\right)\)
b)\(\left(x+y\right)^3-x.\left(x-3\right).\left(x+3\right)-6x^2=29\)
Tìm x : \(\left(x-1\right)^3-2\left(x-2\right)^2=\left(2+3x\right)^3-3\left(x+1\right)^2-\left(x-1\right)\left(x-2\right)\)
tìm x biết
\(x^2.\left(2\left|x\right|-3\right)=\left|x\right|^2.\left(2\left|x\right|-3\right)\)
tìm x biết :
\(\frac{1}{\left(x-1\right)x}+\frac{1}{\left(x-2\right)\left(x-1\right)}+\frac{1}{\left(x-3\right)\left(x-2\right)}+\frac{1}{\left(x-4\right)\left(x-3\right)}=\frac{x}{x^2-4x}\)
B1 ( kết quả thôi ko cần lời giải)
a) \(\left(4x-3\right)\left(3x+2\right)-\left(6x+1\right)\left(2x-5\right)+1\)
b) \(\left(3x+4\right)^2+\left(4x-1\right)^2+\left(2+5x\right)\left(2-5x\right)\)
c) \(\left(2x+1\right)\left(4x^2-2x+1\right)+\left(2-3x\right)\left(4+6x+9x^2\right)-9\)
B2 tìm x(kết quả)
a) \(3x\left(x-4\right)-x\left(5+3x\right)=-34\)
b) \(\left(3x+1\right)^2+\left(5x-2\right)^2=34\left(x+2\right)\left(x-2\right)\)
c) \(x^3+3x^2+3x+28=0\)
Tìm x :
a ) \(\left(x-2\right)^2-\left(x-3\right)\left(x+3\right)=6.\)
b ) \(4\left(x-3\right)^2-\left(2x-1\right)\left(2x+1\right)=10\)
Rút gọn : \(\left[\left(x^3-1-\frac{7-x^3}{3+x^3}\right).\frac{4}{x^5+3x^2}\right]:\left[\frac{3x^6-12}{x^9+6x^6+9x^3}.\frac{x}{3x^3+6}\right]\)
Tìm x :
a ) \(\left(x+2\right)\left(x^2-2x+4\right)-x\left(x-3\right)\left(x+3\right)=26\)
Tìm x
a) \(\left(2x-1\right).\left(2x+1\right)-4x^2=3\)
b) \(5x.\left(x-3\right)^2-5.\left(x-1\right)^3+15.\left(x+2\right).\left(x-2\right)=5\)
