NM
2
K
Khách
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
Các câu hỏi dưới đây có thể giống với câu hỏi trên
QA
3
KN
3 tháng 5 2019
( 2 3/4 - 1 4/5 ) x = 1
=> ( 11/4 - 9/5 ) x = 1
=> 19/20 x = 1
=> x = 1 : 19/20
=> x = 20/19
KN
3 tháng 5 2019
x^2 - 9 .( 3 - 5x ) = 0
=> x^-7 . ( 3 - 5x ) = 0
=> x^-7 = 0 hoặc 3 - 5x = 0
=> Mà x^-7 = 0 => x loại
=> 3 - 5x = 0
=> 5x = 3 - 0 = 3
=> x = 3 : 5
=> x = 3/5
NH
2
15 tháng 5 2017
a) Ta có: \(\left(x-\frac{1}{3}\right)^2-\frac{1}{4}=0\)
\(\Rightarrow\left(x-\frac{1}{2}\right)^2=\frac{1}{4}\)
\(\Rightarrow x-\frac{1}{2}=\frac{1}{2}\Rightarrow x=1\)
hoặc \(x-\frac{1}{2}=-\frac{1}{2}\Rightarrow x=-\frac{1}{2}+\frac{1}{2}=0\)
Vậy \(x\in\left\{1;0\right\}\)
b)\(20\%.x+\frac{2}{5}x=x-4\)
\(\Rightarrow\frac{1}{5}x+\frac{2}{5}x-x=-4\)
\(\Rightarrow\frac{-2}{5}x=-4\)
\(\Rightarrow x=-4:\left(-\frac{2}{5}\right)=10\)
Vậy x=10
c) 3(x+1)+4(x+3)-2(x+16) = 18
=> 3x+3+4x+12-2x-32 =18
=> (3x+4x-2x)+(3+12-32)=18
=> 5x - 17 = 18
=> 5x = 18 + 17 = 35
=> x = 35 : 5 = 7
Vậy x = 7
12 tháng 10 2018
a)100-7.[x-5]=58
7.[x-5]=100-58=42
x-5=42:7=6
x=6+5
x=11
b)12.[x-1]:3=43+23
12 [x-1]:3=64+8
12.[x-1]:3=72
[x-1]:3=72:12=6
[x-1]=6.3=18
x=18-1
x=17
7 tháng 1 2019
tao koooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo biếtttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttt
KN
5 tháng 3 2019
a. \(\frac{1}{3}x-\frac{2}{5}=\frac{2}{3}x+1\)
\(\Leftrightarrow\frac{1}{3}x-\frac{2}{3}x=1+\frac{2}{5}\)
\(\Leftrightarrow-\frac{1}{3}x=\frac{7}{5}\)
\(\Leftrightarrow x=\frac{7}{5}\div\frac{-1}{3}\)
\(\Leftrightarrow x=\frac{21}{-5}\)
b. \(\frac{-4}{5}x+\frac{1}{3}=\frac{2}{3}x+\frac{1}{2}\)
\(\Leftrightarrow\frac{1}{3}-\frac{1}{2}=\frac{2}{3}x+\frac{4}{5}x\)
\(\Leftrightarrow\frac{-1}{6}=\frac{22}{15}x\)
\(\Leftrightarrow x=\frac{-1}{6}\div\frac{22}{15}\)
\(\Leftrightarrow x=\frac{-15}{132}\)
1 tháng 5 2018
\(\left[\frac{4}{5}x+3\right]:\left(-4\right)=\frac{1}{2}\)
\(\frac{4}{5}x+3=\frac{1}{2}\times\left(-4\right)\)
\(\frac{4}{5}x+3=-2\)
\(\frac{4}{5}x=\left(-2\right)-3\)
\(\frac{4}{5}x=-5\)
\(x=\left(-5\right):\frac{4}{5}\)
\(x=-\frac{25}{4}\)
Chúc bạn học giỏi nhé!
Thi học kì thì cố lên !
1 tháng 5 2018
4/5x + 3 = 1/2 . ( -4 )
4/5x + 3 = -4/2
4/5x = -4/2 - 3
4/5x = 5
x = 5 : 4/5
x = 25/4
vay x = 25/4
S
26 tháng 4 2019
\(a)\left(3\frac{1}{2}-x\right).1\frac{1}{4}=\frac{15}{6}\)
\(\left(\frac{7}{2}-x\right).\frac{5}{4}=\frac{15}{6}\)
\(\frac{7}{2}-x=\frac{15}{6}:\frac{5}{4}\)
\(\frac{7}{2}-x=2\)
\(x=\frac{7}{2}-2\)
\(\Rightarrow x=\frac{3}{2}\)
QS
3
23 tháng 6 2018
\(a,\frac{1}{2}-\frac{2}{5}+3x=\frac{3}{4}\)
\(\frac{1}{10}+3x=\frac{3}{4}\)
\(3x=\frac{3}{4}-\frac{1}{10}\)
\(3x=\frac{13}{20}\)
\(x=\frac{13}{60}\)
\(b,2\cdot\left(\frac{3}{4}-5x\right)=\frac{4}{5}-3x\)
\(\frac{3}{2}-10x=\frac{4}{5}-3x\)
\(-10x+3x=\frac{4}{5}-\frac{3}{2}\)
\(-7x=\frac{-7}{10}\)
\(x=\frac{1}{10}\)
20 tháng 4 2017
a)12(x-1)=0
=>x-1=0
=>x=1
b) 3/5x-3/4=(-3)2-|-11|
3/5x-3/4=9-11=-2
3/5x=-2+3/4=-5/4
=>x=-5/4:3/5=-25/12
c)4(x-5/8)-3/4=0,25
4(x-5/8)=0,25+3/4=1
=>x-5/8=1/4
x=1/4+5/8=7/8
2) Số đó là
27:3/5=45
2 tháng 4 2016
làm mẫu nhé:
a) /4/5 - 1/5x/ - 2/3 = 1/5
=> /4/5 - 1/5x/ = 1/5 + 2/3 = 13/15
=> /4/5 - 1/5x/ = 13/15
/ 4/5 - 1/5x / = -13/15
=> 1/5x = 4/5 - 13/15 = -1/15 => x = -1/15 : 1/5 = -1/3
=> 1/5x = 4/5 - (-13/15) = 5/3 => x = 5/3 : 1/5 = 25/3
còn lại tương tự nha
\(\dfrac{1}{4}\left(\dfrac{2}{5}x-\dfrac{1}{4}\right)-\dfrac{3}{4}=-\dfrac{3}{2}\)
=>\(\dfrac{1}{4}\left(\dfrac{2}{5}x-\dfrac{1}{4}\right)=-\dfrac{3}{2}+\dfrac{3}{4}=\dfrac{-3}{4}\)
=>\(\dfrac{2}{5}x-\dfrac{1}{4}=-3\)
=>\(\dfrac{2}{5}x=-3+\dfrac{1}{4}=\dfrac{-11}{4}\)
=>\(x=-\dfrac{11}{4}:\dfrac{2}{5}=\dfrac{-11}{4}\cdot\dfrac{5}{2}=\dfrac{-55}{8}\)
\(\dfrac{1}{4}\cdot\left(\dfrac{2}{5}x-\dfrac{1}{4}\right)-\dfrac{3}{4}=-\dfrac{3}{2}\)
\(\Rightarrow\dfrac{1}{4}\cdot\left(\dfrac{2}{5}x-\dfrac{1}{4}\right)=-\dfrac{3}{2}+\dfrac{3}{4}\)
\(\Rightarrow\dfrac{1}{4}\cdot\left(\dfrac{2}{5}x-\dfrac{1}{4}\right)=\dfrac{-3}{4}\)
\(\Rightarrow\dfrac{2}{5}x-\dfrac{1}{4}=\dfrac{-3}{4}\cdot4\)
\(\Rightarrow\dfrac{2}{5}x-\dfrac{1}{4}=-3\)
\(\Rightarrow\dfrac{2}{5}x=-3+\dfrac{1}{4}\)
\(\Rightarrow\dfrac{2}{5}x=\dfrac{-35}{4}\)
\(\Rightarrow x=\dfrac{-11}{4}:\dfrac{2}{5}\)
\(\Rightarrow x=\dfrac{-55}{8}\)