b ) \(\left(2x-5\right)\left(x-3\right)=2x^2+2004\)
\(\Leftrightarrow2x^2-6x-5x+15=2x^2+2004\)
\(\Leftrightarrow2x^2-11x+15=2x^2+2004\)
\(\Leftrightarrow2x^2-2x^2-11x=2004-15\)
\(\Leftrightarrow-11x=1989\)
\(\Leftrightarrow x=-\frac{1989}{11}\)
b ) \(\left(2x-5\right)\left(x-3\right)=2x^2+2004\)
Tìm x
a) \(\left(2x-1\right).\left(2x+1\right)-4x^2=3\)
b) \(5x.\left(x-3\right)^2-5.\left(x-1\right)^3+15.\left(x+2\right).\left(x-2\right)=5\)
Tìm min :
a) \(A=\left|x-7\right|+\left|x+5\right|\)
b) \(B=\left(2x-1\right)^2-3\left|2x-1\right|+2\)
Tim x
a) \(\left(4x+3\right).\left(4x-3\right)-\left(4x-5\right)^2=46\)
b) \(\left(x+1\right)^3+2x-\left(x-1\right)^3-3.\left[\left(x+1\right)^2+\left(x-1\right)^2\right]+5=0\)
Tìm x :
a ) \(\left(x-2\right)^2-\left(x-3\right)\left(x+3\right)=6.\)
b ) \(4\left(x-3\right)^2-\left(2x-1\right)\left(2x+1\right)=10\)
Tim x
a) \(\left(x+3\right)^3-x.\left(3x+1\right)^2+\left(2x+1\right).\left(4x^2-2x+1-3x^2\right)=54\)
b) \(\left(x-3\right)^3-\left(x-3\right).\left(x^2+3x+9\right)+6.\left(x+1\right)^2+3x^2=-33\)
Giải các PT sau:
a)\(2x\left(8x-1\right)^2\left(4x-1\right)=9\)
b)\(\left(12x+7\right)^2\left(3x+2\right)\left(2x+1\right)=3\)
c)\(\left(2x+1\right)\left(x+1\right)^2\left(2x+3\right)=18\)
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: \(\left(2x-1\right)^3-3\left(3x+1\right)^2=\left(3+2x\right)^3-2\left(2-x\right)^2-\left(x-1\right)\left(x+2\right)\)
