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c: -62+x=-14+46

=>\(x-62=46-14=32\)

=>\(x=32+62=94\)

d: \(25+\left(x-5\right)=-123-\left(15-123\right)\)

=>\(x-5+25=-123-15+123\)

=>\(x+20=-15\)

=>\(x=-15-20=-35\)

8 tháng 12 2023

`c) -62 + x = -14 + 46`

`-62 + x = 32`

`x = 32 - (-62)`

`x = 94`

Vậy `x = 94`

`d) 25 + ( x - 5 ) = -123 - ( 15 - 123 )`

`25 + ( x - 5 ) = -123 - 15 + 123`

`25 + ( x - 5 ) = - 15`

`x - 5 = -15 - 25`

`x - 5 = -40`

`x = -40 + 5`

`x = -35`

Vậy `x = -35`

 

29 tháng 11 2021

c) 3(x -1 ) + 3(2 – x) = 0
3x-3+6-3x=0
 3=0 (vô lí)
không có giá trị x thỏa mãn 
d) 5x + 3(x – 8) = 8
5x+3x-24=8
8x=32
x=32:8
x=4

23 tháng 12 2023

Bài 1 

a, -25 . 63 - 25 . 3

= 25 . (-63) - 25 . 3

= 25 . [(-63) - 3]

= 25 . (-66) = -1650

Bài 2

c, (x + 1)2 = 16

=> (x + 1)2 = 42

=> x + 1 = 4 

=> x = 3

d, (-38) - (x - 2) = -16

=> (x - 2) = -38 - (-16) 

=> x - 2 = -38 + 16 = -22

=> x = 2 + (-22) 

=> x = -20

`@` ` \text {Ans}`

`\downarrow`

`a,`

`1/4+3/4*x=3/2-x`

`=> 1/4 + 3/4x - 3/2 + x = 0`

`=> (1/4 - 3/2) + (3/4x + x) = 0`

`=> -5/4 + 7/4x = 0`

`=> 7/4x = 5/4`

`=> x = 5/4 \div 7/4`

`=> x = 5/7`

Vậy, `x=5/7`

`b,`

`3/5*x-1/4=1/10*x-1/2`

`=> 3/5x - 1/4 - 1/10x + 1/2 = 0`

`=> (3/5x - 1/10x) + (-1/4 + 1/2)=0`

`=> 1/2x + 1/4 = 0`

`=> 1/2x = -1/4`

`=> x = -1/4 \div 1/2`

`=> x = -1/2`

Vậy, `x=-1/2`

`c,`

`3x-3/5=x-1/4`

`=> 3x - 3/5 - x + 1/4 = 0`

`=> (3x - x) - (3/5 - 1/4) = 0`

`=> 2x - 7/20 = 0`

`=> 2x = 0,35`

`=> x = 0,35 \div 2`

`=> x = 7/40`

Vậy, `x=7/40`

`d,`

`3/2*x-2/5=1/3*x-1/4`

`=>  3/2x - 2/5 - 1/3x + 1/4 = 0`

`=> (3/2x - 1/3x) - (2/5 - 1/4) = 0`

`=> 7/6x - 3/20 = 0`

`=> 7/6x = 3/20`

`=> x = 3/20 \div 7/6`

`=> x = 9/70`

Vậy, `x=9/70`

`@` `\text {Kaizuu lv uuu}`

a: x*3/4=1/5

=>x=1/5:3/4=1/5*4/3=4/15

b: x*3/7=2/5

=>x=2/5:3/7=2/5*7/3=14/15

c: 1/3+2/9=2/12x

=>1/6x=3/9+2/9=5/9

=>x=5/9*6=30/9=10/3

d: 4/15*x-2/3=1/5

=>4/15*x=2/3+1/5=10/15+3/15=13/15

=>4x=13

=>x=13/4

e: x:1/7=2/3

=>x=2/3*1/7=2/21

f: 1/9:x=7/3

=>x=1/9:7/3=1/9*3/7=3/63=1/21

j: 1/4+5/12=8/3:x

=>8/3:x=3/12+5/12=8/12=2/3

=>x=4

h: =>7/4:x=1/5+1/2=7/10

=>x=7/4:7/10=10/4=5/2

30 tháng 8 2023

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1 tháng 6 2019

a) (x + 5/6) . 12/5 - 5/4 = 35%

=> (x + 5/6) . 12/5 = 7/20 + 5/4

=> (x + 5/6) . 12/5 = 8/5

=> x + 5/6 = 8/5 : 12/5

=> x + 5/6 = 2/3

=> x = 2/3 - 5/6 

=> x = -1/6

b) 3.(x - 1/2) - 5.(x + 3/5) = -x + 1/5

=> 3x - 3/2 - 5x - 3 = -x + 1/5

=> -2x - 9/2 = -x + 1/5

=> -2x + x = 1/5 + 9/2

=> -x = 47/10

=> x = -47/10

1 tháng 6 2019

c) 5/2 - 3.(1/3 - x) = 1/4 - 7x

=> 5/2 - 1 + 3x = 1/4 - 7x

=> 3/2 + 3x = 1/4 - 7x

=> 3/x + 7x = 1/4 - 3/2

=> 10x = -5/4

=> x = -5/4 : 10

=> x = -1/8

d) 1/2x + 4/5 .(5/2 + x) = 15/4

=> 1/2x + 2 + 4/5x = 15/4

=> 13/10x = 15/4 - 2

=> 13/10x = 7/4

=> x = 7/4 : 13/10

=>  x=  35/26

22 tháng 8 2023

\(a,x+\dfrac{1}{4}\times\dfrac{1}{5}=\dfrac{4}{5}\)

\(x+\dfrac{1}{20}=\dfrac{4}{5}\)

\(x=\dfrac{4}{5}-\dfrac{1}{20}\)

\(x=\dfrac{16}{20}-\dfrac{1}{20}\)

\(x=\dfrac{15}{20}=\dfrac{3}{4}\)

\(b,3\dfrac{2}{3}:x=2\dfrac{2}{3}-1\dfrac{1}{2}\)

\(\dfrac{11}{3}:x=\dfrac{8}{3}-\dfrac{3}{2}\)

\(\dfrac{11}{3}:x=\dfrac{7}{6}\)

\(x=\dfrac{11}{3}:\dfrac{7}{6}=\dfrac{22}{7}\)

a: =>x+1/20=4/5

=>x=4/5-1/20=16/20-1/20=15/20=3/4

b: =>11/3:x=8/3-3/2=16/6-9/6=7/6

=>x=11/3:7/6=11/3*6/7=66/21=22/7