\(a,x-1⋮x-3\)

\(\Rightarrow x-3+2⋮x-3\)

\(\Rightarrow2⋮x-3\)

\(x-3=\left\{-2;-1;1;2\right\}\)

\(x=\left\{1;2;4;5\right\}\)

\(b,x+6⋮x-1\)

\(\Rightarrow x-1+7⋮x-1\)

\(\Rightarrow7⋮x-1\)

\(x=\left\{-6;0;2;8\right\}\)

\(c,x⋮x-5\)

\(x-5+5⋮x-5\)

\(5⋮x-5\)

\(x=\left\{0;4;6;11\right\}\)

đáp án là b, nha

sgk lop 5 trang 43

\(\frac{3}{x+5}=15\%\)

\(\frac{3}{x+5}=\frac{15}{100}\)

\(\frac{3}{x+5}=\frac{3}{20}\)

\(\Rightarrow x+5=20\)

\(\Rightarrow x=20-5\)

\(\Rightarrow x=15\)

~ 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 ~

\(\frac{3}{X}\)+5=\(\frac{15}{100}\)

\(\frac{3}{X}\)+5=\(\frac{3}{20}\)

\(\frac{3}{X}\)=\(\frac{3}{20}\)-5

\(\frac{3}{X}\)=\(-\frac{97}{20}\)

X=\(-\frac{97}{20}\)\(:\)3

X=\(-\frac{97}{60}\)

ghi rõ ra

\(\Leftrightarrow\left(3x-1\right)^2-4^2=0\)

\(\Leftrightarrow\left(3x-1-4\right)\left(3x-1+4\right)=0\)

\(\Leftrightarrow\left(3x-5\right)\left(3x+3\right)=0\Leftrightarrow\orbr{\begin{cases}3x-5=0\\3x+3=0\end{cases}\Leftrightarrow\orbr{\begin{cases}x=\frac{5}{3}\\x=-1\end{cases}}}\)

sách lớp mấy đó bạn

tập bn 

lop 5,tap 2 nha bn

\(\frac{2}{x}=\frac{5}{6}\Rightarrow x=\frac{2\times6}{5}=\frac{12}{5}\)