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|Câu d:
x = 3/4 + 1/-12
x = 9/12 - 1/12
x = 8/12
x = 2/3
Vậy x = 2/3
Câu e:
x /14 = 1/7 + (-3)/14
x/14 = 1/7 - 3/14
x/14 = 2/14 - 3/14
x/14 = -1/14
x = - 1/14 x 14
x = -1
Vậy x = -1
\(-\frac{1}{10}< =x< =\frac{3}{5}\)
\(\frac{-4}{9}< x< =\frac{2}{3}\)
1)x=-30
2)x=-81
3)x=4
4)x=62
5)x=6
6)-13
7)-13
8)-31
9)x=-6;0;6;12
tk minh nha
Bài 1 :
a, 3/5 +12 +7/5+17/24
= 2+12+17/24
= 14 +17/24
= 353/24
b, = 1 + -1 + -1/35
= -1/35
Bài 2 : <=> -5+1 < hoặc = x < hoặc = 1/3
<=> -4 ''''''''''''''''''''''''''''''''''''''''''''= 1/3
=> x
1) x - 2 = -6
x = -6 + 2
x = -4
2) -5 . x - ( -3 ) =13
-5 . x = 13 + ( -3 )
-5 . x = 10
x = 10 : ( -5 )
x = -2
\(\Leftrightarrow\frac{-2}{17}\le\frac{x}{17}\le\frac{2}{17}\Rightarrow x\in\left(-2;-1;0;1;2\right)\)
\(\Leftrightarrow\frac{-1}{24}\le\frac{x}{24}\le\frac{5}{24}\Rightarrow x\in\left(-1;0;1;2;3;4;5\right)\)
2 câu sau tự làm nha
\(-\frac{5}{17}+\frac{3}{17}\le\frac{x}{17}\le\frac{13}{17}+-\frac{11}{17}\)
\(\frac{-2}{17}\le\frac{x}{17}\le\frac{2}{17}\)
=> \(x\in\left\{-2;-1;0;1;2\right\}\)
Bài 1:
5; (-23) + 105
= 105 - 23
= 82
6; 78 + (-123)
= 78 - 123
= - (123 - 78)
= - 45
bài1
1)2763 + 152 = 2915
2)-7 +(-14)
=-(14 +7)
=-21
\(1)\frac{1}{5}+\frac{2}{11}< \frac{x}{55}< \frac{2}{5}+\frac{1}{55}\)
\(\Rightarrow\frac{11}{55}+\frac{10}{55}< \frac{x}{55}< \frac{22}{55}+\frac{1}{55}\)
\(\Rightarrow\frac{21}{55}< \frac{x}{55}< \frac{23}{55}\)
\(\Rightarrow21< x< 23\)
\(\Rightarrow x=22\)
\(2)\frac{11}{3}+\frac{-19}{6}+\frac{-15}{2}\le x\le\frac{19}{12}+\frac{-5}{4}+\frac{-10}{3}\)
\(\Rightarrow\frac{22}{6}+\frac{-19}{6}+\frac{-45}{6}\le x\le\frac{19}{12}+\frac{-15}{12}+\frac{-40}{12}\)
\(\Rightarrow\frac{22+\left[-19\right]+\left[-45\right]}{6}\le x\le\frac{19+\left[-15\right]+\left[-40\right]}{12}\)
\(=\frac{-42}{6}\le x\le\frac{-36}{12}\)
\(\Rightarrow-7\le x\le-3\)
\(\Rightarrow x\in\left\{-7;-6;-5;-4;-3\right\}\)
các bn lm đến đâu cx dc miễn là lm hộ mk cái ạ, ai đang lm vào nhắn tin vs mk để mk bít nha
a; \(-\dfrac{8}{3}+\dfrac{7}{5}-\dfrac{71}{15}< x< -\dfrac{13}{7}+\dfrac{19}{14}-\dfrac{7}{2}\)
-\(\dfrac{19}{15}\) - \(\dfrac{71}{15}\) < \(x\) < -\(\dfrac{1}{2}\) - \(\dfrac{7}{2}\)
-6 < \(x\) < -4
vì \(x\) \(\in\) Z nên \(x\) = -5
- \(\dfrac{19}{6}+\dfrac{-15}{2}+\dfrac{11}{3}\) < \(x\) < - \(\dfrac{5}{4}\) + \(\dfrac{19}{12}\) - \(\dfrac{10}{3}\)
- \(\dfrac{32}{3}+\dfrac{11}{3}< x< \) \(\dfrac{1}{3}\) - \(\dfrac{10}{3}\)
-7 < \(x\) < - 3
Vì \(x\in\) Z nên \(x\in\) {-6;-5;-4}
c; - \(\dfrac{6}{7}\) + \(\dfrac{3}{35}\) < \(x\) < - \(\dfrac{2}{5}\) + \(\dfrac{3}{7}\)
- \(\dfrac{27}{35}< x< \) \(\dfrac{1}{35}\)
-27 < \(x\) < 1
Vì \(x\in\) Z nên \(x\in\) {-26; -25; -24;...;0}
d; \(x=\dfrac{3}{4}+\dfrac{1}{-12}\)
\(x=\) \(\dfrac{9}{12}\) - \(\dfrac{1}{12}\)
\(x\) = \(\dfrac{8}{12}\)
\(x=\dfrac{2}{3}\)
Vậy \(x=\dfrac{2}{3}\)
e; \(\dfrac{x}{14}=\dfrac{1}{7}+-\dfrac{3}{14}\)
\(\dfrac{x}{14}\) = \(\dfrac{2}{14}\) - \(\dfrac{3}{14}\)
\(\dfrac{x}{14}\) = - \(\dfrac{1}{14}\)
\(x=-\dfrac{1}{14}\)\(\times\) 14
\(x=-1\)
Vậy \(x=-1\)
\(\dfrac{11}{18}+\dfrac{13}{6}=\dfrac{85}{x}\)
\(\dfrac{11}{18}\) + \(\dfrac{39}{18}\) = \(\dfrac{85}{x}\)
\(\dfrac{50}{18}\) = \(\dfrac{85}{x}\)
\(x\) = 85 : \(\dfrac{50}{18}\)
\(x\) = 30,6
Vậy \(x=30,6\)
g; \(\dfrac{8}{17}+\dfrac{5}{17}< \dfrac{x}{17}< \dfrac{6}{17}+\dfrac{9}{17}\)
\(\dfrac{13}{17}< \dfrac{x}{17}< \dfrac{15}{17}\)
=>13<\(x\)<15
=>\(x=14\)
vậy \(x=14\)