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\(11-\left(3x-1\right)=\frac{9}{2}-\left(5-3,5x\right)\)
\(=>11-3x+1=\frac{9}{2}-5+3,5x\)
\(=>-3x+12=3,5x-\frac{1}{2}\)
\(=>-3x-3,5x=-\frac{1}{2}-12\)
\(=>-6,5x=-12,5\)
\(=>x=\frac{-12,5}{-6,5}=\frac{25}{13}\)
Ủng hộ nha
\(11-\left(3x-1\right)=\frac{9}{2}-\left(5-3,5x\right)\)
\(11-3x+1=\frac{9}{2}-5+3,5x\)
\(12-3x=-\left(0,5\right)+3,5x\)
\(12,5-3x=3,5x\)
\(12,5=6,5x\)
\(x=12,5:6,5=\frac{25}{13}\)
\(a,\left[x+\frac{1}{3}\right]^3=-\frac{8}{27}\)
\(\Leftrightarrow\left[x+\frac{1}{3}\right]^3=\left[-\frac{2}{3}\right]^3\)
\(\Leftrightarrow x+\frac{1}{3}=-\frac{2}{3}\)
\(\Leftrightarrow x=-\frac{2}{3}-\frac{1}{3}=-1\)
Vậy x = -1
a) (x+1/3)3 = -8/27
<=> (x+1/3)3 = (-2/3)3
<=> x + 1/3 = -2/3
<=> x = -1
b) \(\frac{1}{4}x-\frac{8}{12}=1-\frac{3}{2}x\)
\(\Leftrightarrow\frac{7}{4}x=\frac{5}{3}\)
<=> x = 20/21
1 ) (2/3 - 1/2) . x = 5/12
(4/6 - 3/6) . x = 5/12
1/6 . x = 5/12
x = 5/12 : 1/6
x = 5/2
2 ) TH1 :
x + 1/2 = 0
x = 0 - 1/2
x = -1/2
TH2 :
2/3 - 2x = 0
2x = 2/3 - 0
2x = 2/3
x = 2/3 : 2
x = 1/3
Mk định ko tl nhưng thấy ''đề sai'' mk nghĩ bn sai chứ để x là PS ko sai
\(\frac{-2}{3}+\frac{x}{5}=\frac{1}{5}\)
\(\frac{-10}{15}+\frac{3x}{15}=\frac{3}{15}\)
\(-10+3x=3\)
\(3x=3-\left(-10\right)\Leftrightarrow3x=13\Leftrightarrow x=\frac{13}{3}\)
Bài 2 :
1) \(x-70=-45\) 2) \(\frac{4}{7}:x=\frac{12}{28}\)
\(\Rightarrow\) \(x=-45+70\) \(\Rightarrow x=\frac{4}{7}:\frac{12}{28}\)
\(\Rightarrow\) \(x=25\) \(\Rightarrow x=\frac{4}{3}\)
Vậy \(x=25\) Vậy \(x=\frac{4}{3}\)
3) Giống câu c) ở bài 1
4) \(x-50=-35\) 5) \(\frac{4}{7}.x=\frac{11}{18}\)
\(\Rightarrow x=-35+50\) \(\Rightarrow x=\frac{11}{28}:\frac{4}{7}\)
\(\Rightarrow x=15\) \(\Rightarrow x=\frac{77}{72}\)
Vậy \(x=15\) Vậy \(x=\frac{77}{72}\)
6) \(\left(\frac{2}{3}x+2,5\right):2\frac{2}{6}=6\)
\(\Rightarrow\)\(\left(\frac{2}{3}x+2,5\right):\frac{14}{6}=6\)
\(\Rightarrow\) \(\frac{2}{3}x+2,5=6.\frac{14}{6}\)
\(\Rightarrow\frac{2}{3}x+2,5=14\)
\(\Rightarrow\frac{2}{3}x=\frac{23}{2}\)
\(\Rightarrow x=\frac{23}{2}:\frac{2}{3}\)
\(\Rightarrow x=\frac{69}{4}\)
Vậy \(x=\frac{69}{4}\)
Bài 1:
1) \(\frac{7}{5}+\frac{-8}{5}=-\frac{1}{5}\)
2) \(-\frac{6}{5}.\frac{15}{24}=-\frac{3}{4}\)
3) \(\left(\frac{2}{3}+1,5\right)-3,5:7\frac{1}{2}=\)\(\frac{13}{6}-\frac{7}{15}=\frac{17}{10}\)
4) \(\frac{5}{8}-\frac{-7}{9}=\frac{5}{8}+\frac{7}{9}=\frac{101}{72}\)
5)\(\frac{-7}{3}.\frac{12}{28}=-1\)
\(a)\frac{-1}{8}+\frac{-5}{3}\) \(b)\frac{-6}{35}.\frac{-49}{54}\)
\(=\frac{-3}{24}+\frac{-40}{24}\) \(=\frac{\left(-6\right).\left(-49\right)}{35.54}\)
\(=\frac{-43}{24}\) \(=\frac{7}{45}\)
\(c)\frac{-4}{5}:\frac{3}{4}\)
\(=\frac{-4}{5}.\frac{4}{3}\)
\(=\frac{-16}{15}\)
\(\frac{x+2}{5}=\frac{3x-4}{-3}\)
\(\Rightarrow\left(x+2\right).\left(-3\right)=\left(3x-4\right).5\)
\(\Rightarrow-3x-6=15x-20\)
Từ đây chuyển vế đổi dấu là xong nhé!
x+2/5=3x-4/-3
<=> (x+2).3=(3x-4).-3 (nhân chéo 2 vế)
<=> 3x+6=-9x+12
<=>12x=6
<=>x=6/12=1/2
vậy x=1/2
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