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8x = 7,8x + 25
8x - 7,8x = 25
(8 - 7,8)x = 25
0,2x = 25
x = 25 : 0,2
x = 125
\(a,x-1⋮x-3\)
\(\Rightarrow x-3+2⋮x-3\)
\(\Rightarrow2⋮x-3\)
\(x-3=\left\{-2;-1;1;2\right\}\)
\(x=\left\{1;2;4;5\right\}\)
\(b,x+6⋮x-1\)
\(\Rightarrow x-1+7⋮x-1\)
\(\Rightarrow7⋮x-1\)
\(x=\left\{-6;0;2;8\right\}\)
\(c,x⋮x-5\)
\(x-5+5⋮x-5\)
\(5⋮x-5\)
\(x=\left\{0;4;6;11\right\}\)
\(\frac{5}{18.21}+\frac{5}{21.24}+\frac{5}{24.27}+...+\frac{5}{123.126}\)
\(=\frac{5}{3}\left(\frac{3}{18.21}+\frac{3}{21.24}+\frac{3}{24.27}+...+\frac{3}{123.126}\right)\)
\(=\frac{5}{3}\left(\frac{1}{18}-\frac{1}{21}+\frac{1}{21}-\frac{1}{24}+\frac{1}{24}-\frac{1}{27}+...+\frac{1}{123}-\frac{1}{126}\right)\)
\(=\frac{5}{3}\left(\frac{1}{18}-\frac{1}{126}\right)\)
\(=\frac{5}{3}.\frac{1}{21}\)
\(=\frac{5}{63}\)
Study well ! >_<
Ta có: x - 3|x + 5| = 7
=> 3|x + 5| = x - 7
\(\Rightarrow\orbr{\begin{cases}3\left(x+5\right)=x-7\\3\left(x+5\right)=7-x\end{cases}\Rightarrow\orbr{\begin{cases}3x+15=x-7\\3x+15=7-x\end{cases}}}\)
\(\Rightarrow\orbr{\begin{cases}2x=-22\\4x=-8\end{cases}\Rightarrow\orbr{\begin{cases}x=-11\\x=-2\end{cases}}}\)
Vậy x = -11 , x = -2
\(5\left(x+35\right)=512\)
\(x+35=512:5\)
\(x+35=102,4\)
\(x=102,4-35\)
\(x=67,4\)
C2: \(5\left(x+35\right)=512\)
\(5x+5.35=512\)
\(5x+175=512\)
\(5x=512-175\)
\(5x=337\)
\(x=67,4\)
66 x 25 +5 x 66+66 x 14 + 33 x 66
= 66 x ( 25+5+14+33)
= 66 x 77
= 11 x 6 x 11 x 7
= 11 x( 6x 7)
= 11 x 42
= 462
tick cho mình nha,Mạnh Dũng
\(3\cdot\left(x-2\right)^2=2+25\)
\(\Leftrightarrow3\cdot\left(x-2\right)^2=27\)
\(\Leftrightarrow\left(x-2\right)^2=9\)
\(\Leftrightarrow\orbr{\begin{cases}x-2=3\\x-2=-3\end{cases}}\Leftrightarrow\orbr{\begin{cases}x=5\\x=-1\end{cases}}\)
x10 = 1x
=> x10 = 1 (vì 1 mũ mấy cũng bằng 1)
=> x10 = 110
=> x = 1.
\(\frac{3}{x+5}=15\%\)
\(\frac{3}{x+5}=\frac{15}{100}\)
\(\frac{3}{x+5}=\frac{3}{20}\)
\(\Rightarrow x+5=20\)
\(\Rightarrow x=20-5\)
\(\Rightarrow x=15\)
~ Thiên mã ~
\(\frac{3}{x}+5=15\%\)
\(\frac{3}{x}+5=\frac{3}{20}\)
\(\frac{3}{x}=\frac{3}{20}-5\)
\(\frac{3}{x}=\frac{-97}{20}\)
\(\Rightarrow\left(-97\right)x=3.20\)
\(\Rightarrow\left(-97\right)x=60\)
\(\Rightarrow x=60:\left(-97\right)\)
\(\Rightarrow x=\frac{-60}{97}\)
~ Hok tốt ~