X+Xx2,7+Xx6, 3=63
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X x ( 7,3 + 2,7 - 1 ) = 405
X x 9 = 405
X = 405 : 9 = 45
Vậy x = 45
Tk mk nha
7,3 x X + X x 2,7 - X x 1 = 405
X x (7,3 +2,7 - 1) = 405
X x 9 = 405
X = 405 : 9
X = 45
20% = 1/5
ta có : X -1/5 x X =216
X x (1- 1/5 )= 216
X x 4/5 =216
X = 216 :4/5
X = 270 chắc chắn đúng đấy bạn
\(x\times6+x\div3=\frac{1}{2}\)
\(\Leftrightarrow x\times6+x\div\frac{3}{1}=\frac{1}{2}\)
\(\Leftrightarrow x\times6+x\times\frac{1}{3}=\frac{1}{2}\)
\(\Leftrightarrow x\times\left[6+\frac{1}{3}\right]=\frac{1}{2}\)
\(\Leftrightarrow x\times\frac{19}{3}=\frac{1}{2}\)
\(\Leftrightarrow x=\frac{1}{2}:\frac{19}{3}=\frac{3}{38}\)
Study well >_<
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Xx2+Xx4+Xx6+...+Xx18+Xx20
=Xx(2+4+6+...+18+20)
=Xx 110
=??????????????
\(x^6+2x^3+1=0\)
\(\Leftrightarrow\left(x^3\right)^2+2x^3+1=0\)
\(\Leftrightarrow\left(x^3+1\right)^2=0\)
\(\Leftrightarrow x^3=\left(-1\right)^3\)
\(\Leftrightarrow x=-1\)
___________
\(x\left(x-5\right)=4x-20\)
\(\Leftrightarrow x\left(x-5\right)-4\left(x-5\right)=0\)
\(\Leftrightarrow\left(x-5\right)\left(x-4\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}x=4\\x=5\end{matrix}\right.\)
_____________
\(x^4-2x^2=8-4x^2\)
\(\Leftrightarrow x^2\left(x^2-2\right)+\left(4x^2-8\right)=0\)
\(\Leftrightarrow x^2\left(x^2-2\right)+4\left(x^2-2\right)=0\)
\(\Leftrightarrow\left(x^2-2\right)\left(x^2+4\right)=0\)
\(\Leftrightarrow x^2=2\)
\(\Leftrightarrow x=\pm\sqrt{2}\)
_______________
\(\left(x^3-x^2\right)-4x^2+8x-4\)
\(\Leftrightarrow x^2\left(x-1\right)-4\left(x^2-2x+1\right)=0\)
\(\Leftrightarrow x^2\left(x-1\right)-4\left(x-1\right)^2=0\)
\(\Leftrightarrow\left(x-1\right)\left(x^2-4x+4\right)=0\)
\(\Leftrightarrow\left(x-1\right)\left(x-2\right)^2=0\)
\(\Leftrightarrow\left[{}\begin{matrix}x=1\\x=2\end{matrix}\right.\)
\(x+x\times2,7+x\times6,3=63\\ x\times1+x\times2,7+x\times6,3=63\\ x\times\left(1+2,7+6,3\right)=63\\ x\times10=63\\ x=63:10\\ x=6,3\)