tim x ,5x-x=4088
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a/ 2x + 3x = 1505
\(\Rightarrow\)5x = 1505
\(\Rightarrow\)x = 1505 : 5 = 301
Vậy x = 301
b/ 5x - x = 4088
\(\Rightarrow\)4x = 4088
\(\Rightarrow\)x = 4088 : 4 = 1022
Vậy x = 1022
a) 2x + 3x = 1505
=> 5x = 1505
x = 1505 : 5
x = 301
b) 5x - x = 4088
=> 4x = 4088
x = 4088 : 4
x = 1022
a ) \(2x+3x=1505=x\left(2+3\right)=1505=>5x=1505\)
\(=>x=301\)
b ) \(5x-x=4088=>x\left(5-1\right)=4088\)
\(=>4x=4088=>x=1022\)
a) 2x + 3x = 1505
x ( 2 + 3 ) = 1505
x . 5 = 1505
x = 1505 : 5
x = 301
b) 5x - x = 4088
5x - 1x = 4088
( 5 - 1 ) x = 4088
4x = 4088
x = 4088 : 4
x = 1022
a)\(2x+3x=1505\)
=>\(x\left(2+3\right)=1505\)
=>x.5=1505
=>x=1505:5
=>x=301
b)\(5x-x=4088\)
=>x(5-1)=4088
=>x.4=4088
=>x=4088:4
=>x=1022
a) 2x + 3x = 1505
(2 + 3)x = 1505
5x = 1505
x = 1505 : 5
x = 301
b) 5x - x = 4088
5x - 1x = 4088
(5 - 1)x = 4088
4x = 4088
x = 4088 : 4
x = 1022
\(a,2x+15=27\)
\(\Rightarrow2x=27-15\)
\(\Rightarrow2x=12\)
\(\Rightarrow x=12\div2\)
\(\Rightarrow x=6\)
a)x-289=0 d)31+x=928-128
x =0+289 x=800-31
x =289 x=769
Vây x=289 Vậy x=769
b)84-x=54:54 e)5x=1505
84-x=1 x=301
x=84-1 Vậy x=301
x=83 f)4.x=4088
Vậy x=83 x=1022
c)7.x=704+10 Vậy x=1022
x=714:7 nha!
x=102
Vậy x=102
(x-289).47=0
x-289=0:47
x-289=0
\(\Rightarrow\)x=0+289
Vậy x=289
54.(84-x)=54
84-x=54:54
84-x=1
\(\Rightarrow\)x=84-1
Vậy x=83
7.x-10=704
7.x=704+10
7.x=714
\(\Rightarrow\)x=714:7
Vậy x=102
928-(31+x)=128
31+x=928-128
31+x=800
\(\Rightarrow\)x= 800-31
Vậy x=769
2.x+3.x=1505
(2+3).x=1505
5.x=1505
\(\Rightarrow\)x=1505:5
Vậy x= 301
5.x-x=4088
(5-1).x=4088
4.x=4088
x=4088:4
Vậy x= 1022
\(|x^2-5x+4|=4x-4\)
\(\Rightarrow|\left(x-1\right)\left(x-4\right)|=4\left(x-1\right)\)
\(\Rightarrow\orbr{\begin{cases}\left(x-1\right)\left(x-4\right)=4\left(x-1\right)\\\left(x-1\right)\left(x-4\right)=-4\left(x-1\right)\end{cases}}\)
TH1 :
\(\left(x-1\right)\left(x-4\right)=4\left(x-1\right)\)
\(\Rightarrow\left(x-1\right)\left(x-4\right)-4\left(x-1\right)=0\)
\(\Rightarrow\left(x-1\right)\left(x-8\right)=0\)
\(\Rightarrow\orbr{\begin{cases}x=1\\x=8\end{cases}}\)
Th2:
\(\left(x-1\right)\left(x-4\right)=-4\left(x-1\right)\)
\(\Rightarrow\left(x-1\right)\left(x-4\right)+4\left(x-1\right)=0\)
\(\Rightarrow\left(x-1\right)x=0\)
\(\Rightarrow\orbr{\begin{cases}x=1\\x=0\end{cases}}\)
\(\Rightarrow S=\left\{0;1;8\right\}\)
ab, \(M\left(x\right)=x+7-2x-5=-x+2\)
c, \(x+7=-\left(-2x-5\right)\Leftrightarrow x+7=2x+5\Leftrightarrow x=2\)
5x - x = 4088
( 5 - 1 ) x = 4088
4x = 4088
x = 4088 : 4
x = 1022
x.(5-1)=4088
4x=4088
x=4088:4
x=1022