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( 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
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
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
\(a,\frac{1}{2}-\frac{2}{5}+3x=\frac{3}{4}\)
\(\frac{1}{10}+3x=\frac{3}{4}\)
\(3x=\frac{3}{4}-\frac{1}{10}\)
\(3x=\frac{13}{20}\)
\(x=\frac{13}{60}\)
\(b,2\cdot\left(\frac{3}{4}-5x\right)=\frac{4}{5}-3x\)
\(\frac{3}{2}-10x=\frac{4}{5}-3x\)
\(-10x+3x=\frac{4}{5}-\frac{3}{2}\)
\(-7x=\frac{-7}{10}\)
\(x=\frac{1}{10}\)
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
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\(\frac{\left(x+2\right)}{4}=\frac{5x}{3}\)
\(\Rightarrow3\left(x+2\right)=20x\)
\(\Rightarrow3x+6=20x\)
\(\Rightarrow3x-20x=-6\)
\(\Rightarrow-17x=-6\)
\(\Rightarrow x=-6:-17=\frac{6}{17}\)
a)x+15=-7
x=(-7)-15
x=-22
b)\(\left(5x-2\right).8^3=8^4\)
(5x-2).512=4096
(5x-2)=4096:512
(5x-2)=8
5x=8+2
5x=10
x=10:5
x=2
c)|x-1|=2
=>x-1=2 hoac x-1=-2
x=2+1 x=-2+1
x=3 x=-1
a/ => x = (-7) - 15 = -22
Vậy x = -22
b/ (5x - 2) . 83 = 84
=> 5x - 2 = 8
=> 5x = 10
=> x = 2
Vậy x = 2
c/ => x - 1 = 2 => x = 3
hoặc x - 1 = -2 => x = -1
Vậy x = 3 ; x = -1