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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
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 2.(x+4)+5=65
2.(x+4)=65-5
2.(x+4)=60
x+4=60:2
x+4=30
x=30-4=26
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\(\left(x+2\right)-2=0\)
\(\Rightarrow x+2-2=0\)
\(\Rightarrow x=0\)
\(\left(x+3\right)+1=7\)
\(\Rightarrow x+3+1=7\)
\(\Rightarrow x+4=7\)
\(\Rightarrow x=3\)
\(\left(3x-4\right)+4=12\)
\(\Rightarrow3x-4+4=12\)
\(\Rightarrow3x=12\)
\(\Rightarrow x=4\)
\(\left(5x+4\right)-1=13\)
\(\Rightarrow5x+4-1=13\)
\(\Rightarrow5x+3=13\)
\(\Rightarrow5x=10\)
\(\Rightarrow x=2\)
\(\left(4x-8\right)-3=5\)
\(\Rightarrow4x-8-3=5\)
\(\Rightarrow4x-11=5\)
\(\Rightarrow4x=16\)
\(\Rightarrow x=4\)
\(8-\left(2x+4\right)=2\)
\(\Rightarrow8-2x-4=2\)
\(\Rightarrow4-2x=2\)
\(\Rightarrow2x=2\)
\(\Rightarrow x=1\)
\(7+\left(5x+2\right)=14\)
\(\Rightarrow7+5x+2=14\)
\(\Rightarrow9+5x=14\)
\(\Rightarrow5x=5\)
\(\Rightarrow x=1\)
\(5-\left(3x-11\right)=1\)
\(\Rightarrow5-3x+11=1\)
\(\Rightarrow16-3x=1\)
\(\Rightarrow3x=15\)
\(\Rightarrow x=5\)
![](https://rs.olm.vn/images/avt/0.png?1311)
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
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c) x.(1+2+3+4+...+100)=0
x.5050=0
x=0:5050=0
Vậy x=0
d) x.(1+2+3+4+5+...+100)=5050
x.5050=5050
x=1
Vậy x=1
e) x+1+x+2+x+3+x+4+...+x+100=5050
(x+x+x+x+...+x)+(1+2+3+4+...+100)=5050
100 số hạng x
x.100+5050=5050
x.100=0
x=0
Vậy x=0
![](https://rs.olm.vn/images/avt/0.png?1311)
a) <=> 2x - 1 = 0 hoặc 5x + 2 = 0
<=> 2x = 1 hoặc 5x = -2
<=> x = \(\frac{1}{2}\) hoặc x = \(-\frac{2}{5}\)
b) <=> 3/7 . (1 + 1/x) = 1/4
=> 1 + 1/x = 7/12 <=> 1/x = -5/12
<=> -5/-5x = -5/12 <=> -5x = 12
<=> x = \(-\frac{12}{5}\)
c) Dễ thấy 3x + 5 > 2x - 3
Để (3x + 5)( 2x - 3) < 0 thì 3x + 5 > 0 và 2x - 3 < 0
<=> x > -5/3 và x < 3/2
Vậy \(-\frac{5}{3}< x< \frac{3}{2}\)
a) (2x-1).(5x+2) = 0
\(\Leftrightarrow\) 2x-1 = 0 hoặc 5x+2 = 0
\(\Leftrightarrow\) 2x = 1 hoặc 5x = -2
\(\Leftrightarrow\) x = \(\frac{1}{2}\) hoặc x = \(\frac{-2}{5}\)
b) \(\frac{3}{7}+\frac{3}{7}:x=\frac{-1}{2}-\left(\frac{-3}{4}\right)\)
\(\frac{3}{7}+\frac{3}{7}:x=\frac{-1}{2}+\frac{3}{4}\)
\(\frac{3}{7}+\frac{3}{7}:x=\frac{1}{4}\)
\(\frac{3}{7}:x=\frac{1}{4}-\frac{3}{7}\)
\(\frac{3}{7}:x=\frac{-5}{28}\)
\(x=\frac{3}{7}:\frac{-5}{28}\)
\(x=\frac{-12}{5}\)
Ta có:
TH1: x-3=0
x =0+3=3
TH2: 4-5x=0
5x=4-0
5x=4
Đoạn này nếu muốn giải thêm thì:
x=4/5
x=0.8
Hoặc:
5x=4( loại)
Ta có:
TH1: x-3=0
x =0+3=3
TH2: 4-5x=0
5x=4-0
5x=4
Đoạn này nếu muốn giải thêm thì:
x=4/5
x=0.8
Hoặc:
5x=4( loại)