20+50+...=121
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a: \(\Leftrightarrow\left|2x-3\right|=7\)
\(\Leftrightarrow\left[{}\begin{matrix}2x-3=7\\2x-3=-7\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=5\\x=-2\end{matrix}\right.\)
a, \(\sqrt{\left(2x-3\right)^2}=7\\ \Rightarrow\left|2x-3\right|=7\\ \Rightarrow\left[{}\begin{matrix}2x-3=7\\2x-3=-7\end{matrix}\right.\\ \Rightarrow\left[{}\begin{matrix}x=5\\x=-2\end{matrix}\right.\)
c, \(\sqrt{x^2-9}-3\sqrt{x-3}=0\\ \Rightarrow\sqrt{x-3}\sqrt{x+3}-3\sqrt{x-3}=0\\ \Rightarrow\sqrt{x-3}\left(\sqrt{x+3}-3\right)=0\\ \Rightarrow\left[{}\begin{matrix}\sqrt{x-3}=0\\\sqrt{x+3}-3=0\end{matrix}\right.\\ \Rightarrow\left[{}\begin{matrix}x-3=0\\x+3=9\end{matrix}\right.\\ \Rightarrow\left[{}\begin{matrix}x=3\left(tm\right)\\x=6\left(tm\right)\end{matrix}\right.\)
121 x 34 + 11 x 11 x 50 + 121 x 26
= 121 x 34 + 121 x 50 + 121 x 26
= 121 x (34 + 50 + 26)
= 121 x 110
= 13 310
121 x 34 + 11 x 11 x 50 + 121 x 26
= 121 x ( 34 + 26 ) + 11 x 11 x 50
= 121 x ( 34 + 26 ) + 121 x 50
= 121 x ( 34 + 26 + 50 )
= 121 x 110
= 13 310
=2/10+3/10+4/10+......+13/10
=\(\frac{2+3+4+......+13}{10}\)
=90/10=9
k cho mình nha
-121-(-35-x)=50
=>-121+35+x=50
=>x=50+121-35
=>x=136
TK mình nhé
-121-(-35-x)=50
-35-x= -121-50
-35-x= -171
x= -171+-35
x= -206
mk nha
\(\dfrac{15}{35}=\dfrac{15:5}{35:5}=\dfrac{3}{7}\)
\(\dfrac{24}{27}=\dfrac{24:3}{27:3}=\dfrac{8}{9}\)
\(\dfrac{17}{50}\) ( phân số dã tối giản )
\(\dfrac{15}{45}=\dfrac{15:3}{45:3}=\dfrac{5}{15}=\dfrac{5:5}{15:5}=\dfrac{1}{3}\)
\(\dfrac{99}{121}=\dfrac{99:11}{121:11}=\dfrac{9}{11}\)
`24/27` chưa được rút gọn nha:'>
\(\dfrac{24}{27}=\dfrac{24:3}{27:3}=\dfrac{8}{9}\)
51
20+50+41=121
ok nha bạn