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Bài 1:
a)|x+1|-5=20-(-5)
\(\Leftrightarrow\)|x+1|=30
\(\Leftrightarrow\)\(\left[{}\begin{matrix}x+1=30\\x+1=-30\end{matrix}\right.\)
\(\Leftrightarrow\left[{}\begin{matrix}x=29\\x=-31\end{matrix}\right.\)
Vậy x=29 hoặc x=-31.
b)(-7)-|x+1|=32+(-11)
\(\Leftrightarrow\)|x+1|=28
\(\Leftrightarrow\left[{}\begin{matrix}x+1=28\\x+1=-28\end{matrix}\right.\)
\(\Leftrightarrow\left[{}\begin{matrix}x=27\\x=-29\end{matrix}\right.\)
Vậy x=27 hoặc x=-29.
\(a,x-\dfrac{3}{4}=\dfrac{1}{7}\\ x=\dfrac{1}{7}+\dfrac{3}{4}\\ x=\dfrac{25}{28}\\ b,x+\dfrac{7}{5}=\dfrac{9}{8}.\dfrac{4}{27}\\ x+\dfrac{7}{5}=\dfrac{1}{6}\\ x=\dfrac{1}{6}-\dfrac{7}{5}\\ x=\dfrac{-37}{30}\\ c,\dfrac{2}{5}-\dfrac{3}{7}=\dfrac{x}{70}\\ \dfrac{-1}{35}=\dfrac{x}{70}\\ \dfrac{-2}{70}=\dfrac{x}{70}\\ x=-2\\ d,\dfrac{2}{9}-\dfrac{7}{8}.x=1\\ \dfrac{7}{8}.x=\dfrac{2}{9}-1\\ \dfrac{7}{8}.x=\dfrac{-7}{9}\\ x=\dfrac{-7}{9}:\dfrac{7}{8}\\ x=\dfrac{-8}{9}\)
\(a,x-\dfrac{3}{4}=\dfrac{1}{7}\)
\(\Rightarrow x=\dfrac{1}{7}+\dfrac{3}{4}\)
\(\Rightarrow x=\dfrac{25}{28}\)
\(b,x+\dfrac{7}{5}=\dfrac{9}{8}.\dfrac{4}{27}\)
\(\Rightarrow x+\dfrac{7}{5}=\dfrac{1}{6}\)
\(\Rightarrow x=\dfrac{1}{6}-\dfrac{7}{5}\)
\(\Rightarrow x=-\dfrac{37}{30}\)
\(c,\dfrac{2}{5}-\dfrac{3}{7}=\dfrac{x}{70}\)
\(\Rightarrow\dfrac{-1}{35}=\dfrac{x}{70}\)
\(\Rightarrow35x=-70\)
\(\Rightarrow x=-2\)
\(d,\dfrac{2}{9}-\dfrac{7}{8}.x=1\)
\(\Rightarrow\dfrac{7}{8}x=\dfrac{2}{9}-1\)
\(\Rightarrow\dfrac{7}{8}x=-\dfrac{7}{9}\)
\(\Rightarrow x=-\dfrac{8}{9}\)
/s/ | /iz/ | /z/ |
books,students,desks | teachers,classes | numbers,days,games,places |
s:books,students,desks
iz:teachers,classes,
z:numbers,days,games,places
/s/ : books; students; desks
/iz/ : classes; places
/z/ : numbers; days; games; teachers
Học Tốt!!
\(5.\left(x-1\right)-206=2^4.4\\ \Rightarrow5.\left(x-1\right)-206=16.4\\ \Rightarrow5.\left(x-1\right)-206=64\\ \Rightarrow5.\left(x-1\right)=270\\ \Rightarrow x-1=54\\ \Rightarrow x=55.\)
5.(\(x-1\)) - 206 = 24.4
5.(\(x-1\)) - 206 = 64
5.(\(x-1\)) = 64 + 206
5.(\(x-1\)) = 270
\(x-1\) = 270 : 5
\(x-1\) = 54
\(x=55\)