Giải pt sau:
1) (9x2-4)(x+1)=(3x+2)(x2-1)
2) (x-1)2-1+x2=(1-x)(x+3)
3) x2-7x+6=0
4) x4 -4x3+12-9=0
5) (x2+x)2+4(x2+x)-12=0
6) x(x+1)(x2+x+1)=42
7) (x+2)(x-2)(x2-10)=72
8) (x-1)(x-3)(x+5)(x+7)-297=0
9) 4(2x+7)2-9(x+3)2=0
10) x4-2x2-144x-1295=0
...
Đọc tiếp
Giải pt sau:
1) (9x2-4)(x+1)=(3x+2)(x2-1)
2) (x-1)2-1+x2=(1-x)(x+3)
3) x2-7x+6=0
4) x4 -4x3+12-9=0
5) (x2+x)2+4(x2+x)-12=0
6) x(x+1)(x2+x+1)=42
7) (x+2)(x-2)(x2-10)=72
8) (x-1)(x-3)(x+5)(x+7)-297=0
9) 4(2x+7)2-9(x+3)2=0
10) x4-2x2-144x-1295=0
3) \(x^2-7x+6=0\)
\(\Leftrightarrow x^2-6x-x+6=0\)
\(\Leftrightarrow x\left(x-6\right)-\left(x-6\right)=0\)
\(\Leftrightarrow\left(x-6\right)\left(x-1\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}x-6=0\\x-1=0\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=6\\x=1\end{matrix}\right.\)
S=\(\left\{6;1\right\}\)
\(\)