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13 - 2 ( x + 1 ) = 7
2 ( x + 1 ) = 13 - 7
2 ( x + 1 ) = 6
x + 1 = 6:2
x + 1 = 3
x = 3 - 1
x = 2
Bạn Tham Khảo Nha!
A) 13-2(x+1)=7
2(x+1)=13-7
2(x+1)=6
x+1=6:2
x+1=3
x=3-1
x=2
a. 4.(x+41) = 7
x + 41 = 7 : 4 = 1,75
x = 1,75 - 41 = -39,25
b. 4.(x-3) = 72 - 110 = 49 - 1 = 48
x - 3 = 48 : 4 = 12
x = 12 + 3 = 15
\(a,\left(x-\dfrac{1}{2}\right):\dfrac{1}{3}+\dfrac{5}{7}=9\dfrac{5}{7}\)
\(\Leftrightarrow\left(x-\dfrac{1}{2}\right).3=\dfrac{68}{7}-\dfrac{5}{7}\)
\(\Leftrightarrow\left(x-\dfrac{1}{2}\right).3=9\)
\(\Leftrightarrow x-\dfrac{1}{3}=3\)
\(\Leftrightarrow x=3+\dfrac{1}{3}\)
\(\Leftrightarrow x=\dfrac{9}{3}+\dfrac{1}{3}\)
\(\Leftrightarrow x=\dfrac{10}{3}\)
\(b,x+30\%x=-1,31\)
\(\Leftrightarrow x+\dfrac{3}{10}.x=-\dfrac{131}{100}\)
\(\Leftrightarrow x.\left(1+\dfrac{3}{10}\right)=-\dfrac{131}{100}\)
\(\Leftrightarrow x.\dfrac{13}{10}=-\dfrac{131}{100}\)
\(\Leftrightarrow x=-\dfrac{131}{100}.\dfrac{10}{13}\)
\(\Leftrightarrow x=-\dfrac{131}{130}\)
\(c,-\dfrac{2}{3}x+\dfrac{1}{5}=\dfrac{1}{10}\)
\(\Leftrightarrow\dfrac{-2}{3}x=\dfrac{1}{10}-\dfrac{1}{5}\)
\(\Leftrightarrow\dfrac{-2}{3}x=\dfrac{1}{10}-\dfrac{2}{10}\)
\(\Leftrightarrow-\dfrac{2}{3}x=-\dfrac{1}{10}\)
\(\Leftrightarrow x=-\dfrac{1}{10}.\left(-\dfrac{3}{2}\right)\)
\(\Leftrightarrow x=\dfrac{3}{20}\)
a) 4(x+41)=7
x+41=7/4
x=7/4-41
x=157/4
b) có gì đó sai sai-.-
a; \(x\) - \(\dfrac{3}{4}\) = \(\dfrac{1}{7}\)
\(x\) = \(\dfrac{1}{7}\) + \(\dfrac{3}{4}\)
\(x\) = \(\dfrac{4}{28}\) + \(\dfrac{21}{28}\)
\(x\) = \(\dfrac{25}{28}\)
Vậy \(x=\dfrac{25}{28}\)
\(a,\left(23+x\right)-\left(56-x\right)=\left(23+7\right)-\left(56-7\right)=30-49=-19\\ b,25-x-\left(29+y-8\right)=25-13-\left(29+11-8\right)=12-32=-20\)
a) 13 - 2 ( x + 1 ) = 7
=> 2(x+1)=13-7
=>2(x+1)=6
=> x+1=3
=> x=2
b) 15x - 13x = 122 + 56 . 6
=> 15x-13x=93864
=> x.(15-13)=93864
=> x.2=93864
=> x=46947
a)13-2(x+1)=7
2(x+1)=6
x+1=3
x=3-1=2
b)15x-13x=122+56.6
15x-13x=122+93750
2x=93894
x=469847