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\(\frac{7}{8}x-\frac{1}{4}x=\frac{9}{16}\)
\(\Rightarrow\left(\frac{7}{8}-\frac{1}{4}\right)x=\frac{9}{16}\)
\(\Rightarrow\left(\frac{7}{8}-\frac{2}{8}\right)x=\frac{9}{16}\)
\(\Rightarrow\frac{5}{8}x=\frac{9}{16}\)
\(\Rightarrow x=\frac{9}{16}:\frac{5}{8}\)
\(\Rightarrow x=\frac{9}{16}.\frac{8}{5}\)
\(\Rightarrow x=\frac{9}{10}\)
\(x:\frac{14}{5}=-2,5\)
\(\Rightarrow x:\frac{14}{5}=-\frac{5}{2}\)
\(\Rightarrow x=-\frac{5}{2}.\frac{14}{5}\)
\(\Rightarrow x=-7\)
Chúc bạn học tốt !!!
a, \(-2,5\%-\left[1-\left(\frac{2}{3}\right)^2\right]+\left(1-\frac{4}{9}\right)\\ =\frac{-1}{40}-\left[1-\frac{4}{9}\right]+\left(1-\frac{4}{9}\right)\\ =\frac{-1}{40}+\left[\left(1-\frac{4}{9}\right)-\left(1-\frac{4}{9}\right)\right]\\ =\frac{-1}{40}+0\\ =\frac{-1}{40}\)
b, \(5\frac{1}{2}-14\frac{3}{7}:\frac{9}{13}-3\frac{4}{7}:\frac{9}{13}\\ =5\frac{1}{2}-\left(14\frac{3}{7}:\frac{9}{13}+3\frac{4}{7}:\frac{9}{13}\right)\\ =5\frac{1}{2}-\left[\left(14\frac{3}{7}+3\frac{4}{7}\right):\frac{9}{13}\right]\\ =5\frac{1}{2}-\left(18:\frac{9}{13}\right)\\ =5\frac{1}{2}-\left(18\cdot\frac{13}{9}\right)\\ =\frac{11}{2}-26\\ =\frac{-41}{2}\)
c, \(\left(1+2\frac{1}{4}-3\frac{1}{3}\right):\left(1+3\frac{1}{2}-4\frac{7}{12}\right)\\ =\left(3\frac{1}{4}-3\frac{1}{3}\right):\left(4\frac{1}{2}-4\frac{7}{12}\right)\\ =\frac{-1}{12}:\frac{-1}{12}\\ =1\)
a: \(\Leftrightarrow\left(x-\dfrac{2}{5}\right):\dfrac{3}{2}=-\dfrac{5}{4}+\dfrac{5}{2}=\dfrac{5}{4}\)
\(\Leftrightarrow x-\dfrac{2}{5}=\dfrac{5}{4}\cdot\dfrac{3}{2}=\dfrac{15}{8}\)
hay x=91/40
b: \(\Leftrightarrow\left(2.5x-3.6\right)=-1\cdot\dfrac{12}{7}=\dfrac{-12}{7}\)
=>2,5x=66/35
hay x=132/175
c: \(\Leftrightarrow\left(\dfrac{15}{4}-2x\right)=\dfrac{19}{9}:\dfrac{4}{3}=\dfrac{19}{9}\cdot\dfrac{3}{4}=\dfrac{19}{12}\)
=>2x=15/4-19/12=45/12-19/12=26/12
=>x=13/12
a, \(x\) : \(\dfrac{13}{3}\) = -2,5
\(x\) = -2,5 . \(\dfrac{13}{3}\)
\(x\) = \(\dfrac{65}{6}\)
b,\(\dfrac{3}{5}\)\(x\) = \(\dfrac{1}{10}-\)\(\dfrac{1}{4}\)
\(\dfrac{3}{5}x\) = \(\dfrac{-3}{20}\)
\(x\) = \(\dfrac{-3}{20}\) : \(\dfrac{3}{5}\)
\(x\) = \(\dfrac{-1}{4}\)
c, \(\dfrac{25}{9}-\dfrac{12}{13}x=\dfrac{7}{9}\)
\(\dfrac{12}{13}x\)\(=\dfrac{25}{9}-\dfrac{7}{9}\)
\(\dfrac{12}{13}x=2\)
\(x=2:\dfrac{12}{13}\)
\(x=\dfrac{13}{6}\)
1/ Suy ra: -35 + 7x - 2x + 20 = 15
5x - 15 = 15
5x = 30
x = 6
2/ Suy ra: 4x - 20 - 3x - 21 = -19
x - 41 = -19
x = 22
3/ Suy ra: 8 - 4x + 3x - 15 = 14
-7 -x = 14
x = -7 -14
x = -21
4/ Suy ra: 7x - 63 - 30 + 5x = -6 + 11x
7x + 5x - 11x = -6 +63 + 30
x = 87
5/ Suy ra: -21x +35 + 14x - 28 = 28
-21x + 14x = 28 +28 - 35
-7x = 21
x= -3
6/ Suy ra: 20 - 5x + 7x - 14 = -2
2x = -8
x = -4
7/ Suy ra: 4x +15 -5x = 7
-x = -8
x = 8
8/ Suy ra: 5x - 35 +30 -10x = 20
-5x - 5 = 20
-5x = 25
x = -5
9/ Suy ra: 35 - 7x + 5x - 10 = 15
-7x + 5x = 15 +10 - 35
-2x = -10
x = 5
a) x + 4 = – 14 – 9
x + 4 = – 23
x = – 23 – 4
x = – 27
b) 3x = – 14 + 2
3x = – 12
x = – 12 : 3
x = – 4
c) 2| x | = 4 – (– 8)
2| x | = 12
| x | = 6
x = 6 hoặc x = – 6
d) |x – 2| = 7
x – 2 = 7 hoặc x – 2 = – 7
x = 9 hoặc x = – 5
a) (-4)2 . \(\frac{1}{4}\). |-6| + |-6|3 : 6
= 16 . \(\frac{1}{4}\). 6 + 63 : 6
= 4 . 6 + 62
= 24 + 36
= 60
Mà mik nói này chừng nữa có đăng câu hỏi thì bạn đăng ít câu trong 1 lần thôi, bạn mà đăng nhiều câu thế thì người nhìn vào thấy ngán và ko muốn trả lời đâu đó !
Mik giải từng câu nhé !
\(a,\left[0,75x+\frac{5}{2}\right]-\frac{4}{7}-\left[-\frac{1}{3}\right]=-\frac{5}{6}\)
\(\Leftrightarrow\left[0,75x+\frac{5}{2}\right]-\frac{4}{7}+\frac{1}{3}=-\frac{5}{6}\)
\(\Leftrightarrow\left[0,75x+\frac{5}{2}\right]=-\frac{5}{6}-\frac{1}{3}+\frac{4}{7}\)
\(\Leftrightarrow0,75x+\frac{5}{2}=-\frac{25}{42}\)
\(\Leftrightarrow0,75x=-\frac{65}{21}\Leftrightarrow x=-\frac{260}{63}\)
\(b,\left[4x-9\right]\left[2,5+-\frac{7}{3}x\right]=0\)
\(\Leftrightarrow\orbr{\begin{cases}4x-9=0\\2,5+-\frac{7}{3}x=0\end{cases}}\Rightarrow\orbr{\begin{cases}x=\frac{9}{4}\\x=\frac{15}{14}\end{cases}}\)
Vậy \(x\in\left\{\frac{9}{4};\frac{15}{14}\right\}\)
Tham khảo nhé phamthiminhanh
-2,5xX=9/14 : (-24/7)
-2,5xX=-3/16
x=-3/16:(-2,5)
x=3/40
`Answer:`
\(\left(-2,5-x\right)\left(-2\frac{4}{7}\right)=\frac{9}{14}\)
\(\Leftrightarrow\left(-2,5-x\right)\left(-\frac{18}{7}\right)=\frac{9}{14}\)
\(\Leftrightarrow-2,5-x=\frac{9}{14}:\left(-\frac{18}{7}\right)\)
\(\Leftrightarrow-2,5-x=-\frac{1}{4}\)
\(\Leftrightarrow x=-2,5-\left(-\frac{1}{4}\right)\)
\(\Leftrightarrow x=-\frac{9}{4}\)