(2x-5)3=53
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`1/2x +( 2/4+3/6)= 4/5`
`=> 1/2x +( 12/24 + 12/24)=4/5`
`=> 1/2 x+ 24/24=4/5`
`=> 1/2 x+1=4/5`
`=>1/2x=4/5-1`
`=>1/2x= 4/5-5/5`
`=>1/2x= -1/5`
`=>x=-1/5 : 1/2`
`=>x=-1/5 xx 2`
`=>x=-2/5`
`--------`
`3/8 +x=2/5`
`=>x=2/5-3/8`
`=>x= 16/40 - 15/40`
`=>x=1/40`
`@ yl`
a) \(x=-\frac{1}{2}\)
b) \(x=-\frac{29}{15}\)
c) \(x=\frac{5}{6}\)
**** cho mình nhé
Đề này nhá : \(\frac{2x+5}{45}+\frac{2x+6}{44}=\frac{2x-3}{53}+\frac{2x}{50}\)
\(\Leftrightarrow\left(\frac{2x+5}{45}+1\right)+\left(\frac{2x+6}{44}+1\right)=\left(\frac{2x-3}{53}+1\right)+\left(\frac{2x}{50}+1\right)\)
\(\Leftrightarrow\frac{2x+50}{45}+\frac{2x+50}{44}=\frac{2x+50}{53}+\frac{2x+50}{50}\)
\(\Leftrightarrow\frac{2x+50}{45}+\frac{2x+50}{44}-\frac{2x+50}{53}-\frac{2x+50}{50}=0\)
\(\Leftrightarrow\left(2x+50\right)\left(\frac{1}{45}+\frac{1}{44}-\frac{1}{53}-\frac{1}{50}\right)=0\)
Mà \(\left(\frac{1}{45}+\frac{1}{44}-\frac{1}{53}-\frac{1}{50}\right)\ne0\)
Nên 2x + 50 = 0
=> 2x = -50
=> x = -25
a. (2x - 1)5 = x5
=> 2x - 1 = x
2x - x = 1
1x = 1
x = 1
Vậy .......
1) Ta có: \(x^2-4x+4=0\)
\(\Leftrightarrow\left(x-2\right)^2=0\)
\(\Leftrightarrow x-2=0\)
hay x=2
Vậy: S={2}
a, 71.2 – 6.(2x+5) = 10 5 : 10 3
71.2 – 6.(2x+5) = 10 2
6.(2x+5) = 71.2 – 100
6.(2x+5) = 42
x = 1
b, 5 x + 3 4 . 6 8 = 6 9 . 3 4
5 x + 3 4 . 6 8 = 6 8 . 6 . 3 4
5 x + 3 4 = 6 8 . 6 . 3 4 : 6 8 = 6 . 3 4
5x = 6 . 3 4 - 3 4 = 5 . 3 4
x = 3 4
c, 12:{390:[5. 10 2 – ( 5 3 + x . 7 2 )]} = 4
390:[5. 10 2 – ( 5 3 + x . 7 2 )] = 12:4 = 3
5. 10 2 – ( 5 3 + x . 7 2 ) = 390:3 = 130
5 3 + x . 7 2 = 5. 10 2 – 130 = 370
x . 7 2 = 370 – 5 3 = 245
x = 245: 7 2 = 5
d, 5 3 .(3x+2):13 = 10 3 : 13 5 : 13 4
5 3 .(3x+2):13 = 10 3 : 13
3x+2 = 10 3 : 13 : 5 3 .13 = 8
x = 2
(2x-5)3=53
2x-5=5
2x=10
x=5
Trả lời:
( 2x - 5 )3 = 53
=> 2x - 5 = 5
<=> 2x = 10
<=> x = 5
Vậy x = 5