x2-7x+6. giai ho em voi
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\(\left(x+1\right)^2-3\left(x+1\right)=\left(x+1\right)\left(x+1-3\right)=\left(x+1\right)\left(x-2\right)\)
\(2x\left(x-2\right)-\left(x-2\right)^2=\left(x-2\right)\left[2x-\left(x-2\right)\right]=\left(x-2\right)\left(2x-x+2\right)=\left(x-2\right)\left(x+2\right)\)
\(4x^2-20xy+25y^2=\left(2x\right)^2-2.2x.5y+\left(5y\right)^2=\left(2x-5y\right)^2\)
\(x^2+3x-x-3=x\left(x+3\right)-\left(x+3\right)=\left(x-1\right)\left(x+3\right)\)
\(x^2-xy+x-y=x\left(x-y\right)+\left(x-y\right)=\left(x-y\right)\left(x+1\right)\)
\(2y\left(x+2\right)-3x-6=2y\left(x+2\right)-3\left(x+2\right)=\left(x+2\right)\left(2y-3\right)\)
125 x 2 + 2 x 125 - 3 x 5 x 125
= 125 x 2 + 2 x 125 - 15 x 125
= 125( 2 + 2 - 15 )
= 125 x ( -11 )
= -1375
125 x 2 + 2 x 125 - 3 x 5 x 125
125 x 2 + 2 x 125 - 15 x 125
125 x ( 2 + 2 -15 )
125 x ( - 11 ) = ( - 1357 )
Học tốt
1000 - 115 - 230 - 185 - 270
= 1000 - ( 115 + 185) - ( 230 + 270 )
= 1000 - 300 - 500
= 700 - 500
= 200
ok em
1000 - 115 -230 -185 - 270
885 -230 - 185 - 270
655 - 185 - 270
470 - 270
200
Học ttót
(2x+1)3=8000
(2x+1)3=203
=> 2x+1=20
2x =20-1=19
x =19/2
2,56:0,25+10,25x3-2,56x6
=10,24+30,75-15,36
=40,99-15,36
=25,63
**** nha! ^_^
\(x^2-7x+6=0\)
\(\Leftrightarrow x^2-6x-x+6=0\)
\(\Leftrightarrow\left(x^2-6x\right)-\left(x-6\right)=0\)
\(\Leftrightarrow x\left(x-6\right)-\left(x-6\right)\)
\(\Leftrightarrow\left(x-1\right)\left(x-6\right)\)
\(\Leftrightarrow\left[{}\begin{matrix}x=1\\x=6\end{matrix}\right.\)
x\(^2\)-7x+6=0
\(\Leftrightarrow\)x\(^2\)-x-6x+6=0
\(\Leftrightarrow\)x(x-1)-6(x-1)=0
\(\Leftrightarrow\)(x-1)(x-6)=0
\(\Leftrightarrow\)\(\left[{}\begin{matrix}x-1=0\\x-6=0\end{matrix}\right.\)
\(\Leftrightarrow\)\(\left[{}\begin{matrix}x=1\\x=6\end{matrix}\right.\)
Vậy S={1;6}