Gấp x2 r=))Giúp em nhaa, mãi iuu
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B = \(\dfrac{4}{7}\) = \(\dfrac{4.4}{7.4}\) = \(\dfrac{16}{28}\); I = \(\dfrac{6}{13}\) = \(\dfrac{6.\left(-2\right)}{13.\left(-2\right)}\) = \(\dfrac{-12}{-26}\)
N = \(\dfrac{-5}{13}\) = \(\dfrac{-5.3}{13.3}\) = \(\dfrac{-15}{39}\); T = \(\dfrac{7}{21}\) = \(\dfrac{7.4}{21.4}\) = \(\dfrac{28}{84}\)
U = \(\dfrac{4}{11}\) = \(\dfrac{4.5}{11.5}\) = \(\dfrac{20}{55}\); O = \(\dfrac{5}{25}\) = \(\dfrac{5.3}{25.3}\) = \(\dfrac{15}{75}\)
H = \(\dfrac{1}{5}\) = \(\dfrac{1.11}{5.11}\) = \(\dfrac{11}{15}\); A = \(\dfrac{5}{8}\) = \(\dfrac{5.5}{8.5}\) = \(\dfrac{25}{40}\)
G = \(\dfrac{-3}{17}\) = \(\dfrac{-3.5}{17.5}\) = \(\dfrac{-15}{85}\); D = \(\dfrac{4}{16}\) = \(\dfrac{4.5}{16.5}\) = \(\dfrac{20}{80}\)
T | H | A | I | B | I | N | H | D | U | O | N | G |
84 | 11 | 25 | -12 | 16 | -12 | -15 | 11 | 80 | 55 | 75 | -15 | 85 |
\(\left(x+3\right)\left(1-x\right)>0.\\ \Leftrightarrow\left[{}\begin{matrix}\left\{{}\begin{matrix}x+3>0.\\1-x>0.\end{matrix}\right.\\\left\{{}\begin{matrix}x+3< 0.\\1-x< 0.\end{matrix}\right.\end{matrix}\right.\) \(\Leftrightarrow\left[{}\begin{matrix}\left\{{}\begin{matrix}x>-3.\\x< 1.\end{matrix}\right.\\\left\{{}\begin{matrix}x< -3.\\x>1.\end{matrix}\right.\end{matrix}\right.\) \(\Leftrightarrow-3< x< 1.\)
\(\left(x^2-1\right)\left(x^2-4\right)< 0.\\ \Leftrightarrow\left[{}\begin{matrix}\left\{{}\begin{matrix}x^2-1< 0.\\x^2-4>0.\end{matrix}\right.\\\left\{{}\begin{matrix}x^2-1>0.\\x^2-4< 0.\end{matrix}\right.\end{matrix}\right.\) \(\Leftrightarrow\left[{}\begin{matrix}\left\{{}\begin{matrix}x^2< 1.\\x^2>4.\end{matrix}\right.\\\left\{{}\begin{matrix}x^2>1.\\x^2< 4.\end{matrix}\right.\end{matrix}\right.\) \(\Leftrightarrow\left[{}\begin{matrix}\left\{{}\begin{matrix}\left[{}\begin{matrix}x< 1.\\x>-1.\end{matrix}\right.\\\left[{}\begin{matrix}x>2.\\x< -2.\end{matrix}\right.\end{matrix}\right.\\\left\{{}\begin{matrix}\left[{}\begin{matrix}x>1.\\x< -1.\end{matrix}\right.\\\left[{}\begin{matrix}x< 2.\\x>-2.\end{matrix}\right.\end{matrix}\right.\end{matrix}\right.\)\(\Leftrightarrow\left[{}\begin{matrix}\left\{{}\begin{matrix}-1< x< 1.\\\left[{}\begin{matrix}x>2.\\x< -2.\end{matrix}\right.\end{matrix}\right.\\\left\{{}\begin{matrix}\left[{}\begin{matrix}x>1.\\x< -1.\end{matrix}\right.\\-2< x< 2.\end{matrix}\right.\end{matrix}\right.\) \(\Leftrightarrow\left[{}\begin{matrix}x>2.\\x< -2.\\-2< x< -1.\\1< x< 2.\end{matrix}\right.\) \(\Leftrightarrow\left[{}\begin{matrix}x< -2.\\x>2.\end{matrix}\right.\)
\(\left(2x+x^2\right)\left(x^2-3x+2\right)=0\Leftrightarrow x\left(x+2\right)\left(x-1\right)\left(x-2\right)=0\\ \Leftrightarrow\left[{}\begin{matrix}x=0\\x=-2\\x=1\\x=2\end{matrix}\right.\\ A=\left\{-2;0;1;2\right\}\)
\(3\le x^3\le27\Leftrightarrow x\in\left\{2;3\right\}\\ B=\left\{2;3\right\}\)
\(\Leftrightarrow A\cup B=\left\{-2;0;1;2;3\right\}\)
\(x^2+1-12=0\)
Theo Vi - ét , ta có :
\(\left\{{}\begin{matrix}x_1+x_2=-\dfrac{b}{a}=0\\x_1x_2=\dfrac{c}{a}=-11\end{matrix}\right.\)
Ta có :
\(A=x_1^2+x_2^2+x_1^2x_2+x_1x^2_2\)
\(=\left(x_1+x_2\right)^2-2x_1x_2+x_1x_2\left(x_1+x_2\right)\)
\(=0^2-2\left(-11\right)-11\left(0\right)\)
\(=22-11\)
\(=11\)
Vậy \(A=11\)
CN : tôi
VN : còn lại
TN : Mãi đến năm nay , khi đã lên lớp 5
`#3107.101107`
Ta có:
Shình vuông `=`\(a\cdot a\)
Mà \(36=4\cdot4\)
`\Rightarrow` Độ dài cạnh của hình vuông ABCD là `4` cm.
Vậy, độ dài cạnh của hình vuông ABCD là `4` cm.
S hình vuông= a.a
cạnh hình vuông abcd=36cm2=6x6
vậy cạnh hình vuông abcd là 6cm
chúc bạn học tốt
B. $\frac{4}{7}=\frac{16}{28}$
N. $\frac{-5}{13}=\frac{-15}{39}$
U. $\frac{4}{11}=\frac{20}{55}$
H. $\frac{1}{5}=\frac{11}{55}$
G. $\frac{-3}{17}=\frac{-15}{85}$
I. $\frac{6}{13}=\frac{-12}{-26}$
T. $\frac{7}{21}=\frac{28}{84}$
O. $\frac{5}{25}=\frac{15}{75}$
A. $\frac{5}{8}=\frac{25}{40}$
D. $\frac{4}{16}=\frac{20}{80}$