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15 tháng 7 2018

a) \(1045:\left[215-\left(3x-24\right)\right]=5\)

\(\Rightarrow215-\left(3x-24\right)=1045:5\)

\(\Rightarrow215-\left(3x-24\right)=209\)

\(\Rightarrow3x-24=215-209\)

\(\Rightarrow3x-24=6\)

\(\Rightarrow3x=6+24\)

\(\Rightarrow3x=30\)

\(\Rightarrow x=30:3\)

\(\Rightarrow x=10\)

Vậy x = 10

b) \(\left[195-\left(15x+27\right)\right]\times39=4212\)

\(\Rightarrow195-\left(15x+27\right)=4212:39\)

\(\Rightarrow195-\left(15x+27\right)=108\)

\(\Rightarrow15x+27=195-108\)

\(\Rightarrow15x+27=87\)

\(\Rightarrow15x=87-27\)

\(\Rightarrow15x=60\)

\(\Rightarrow x=60:15\)

\(\Rightarrow x=4\)

Vậy x = 4

_Chúc bạn học tốt_

26 tháng 7 2023

a,91-5(5+x)=61

=>25+5x=91-61=30

=>5x=30-25=5

=>x=1

b,\([\left(x+34\right)-50]\)x2=56

=>(x+34)-50=56:2=28

=>x+34=28+50=78

=>x=78-34=44.

c,1045-\([2015-\left(3x-24\right)]\)=5

=>2015-(3x-24)=1045-5=1040

=>3x-24=2015-1040=975

=>3x=975+24=999

=>x=999:3=333

d,\([195-\left(3x-27\right)]\)x39=4212

=>195-(3x-27)=4212:39=108

=>3x-27=195-108=87

=>3x=87+27=117

=>x=39

e,30-3(x-2)=18

=>30-3x+6=18

=>30-3x=18-6=12

=>3x=30-12=18

=>x=18:3=6

26 tháng 7 2023

a) \(...\Rightarrow5\left(5+x\right)=91-61=30\)

\(\Rightarrow\left(5+x\right)=30:5=6\Rightarrow x=6-5=1\)

b) \(...\Rightarrow\left(x+34\right)-50=56:2=28\)

\(\Rightarrow\left(x+34\right)=28+50=78\Rightarrow x=78-34=44\)

c) \(...\Rightarrow2015-\left(3x-24\right)=1045-5=1040\)

\(\Rightarrow\left(3x-24\right)=2015-1040=975\)

\(\Rightarrow3x=975+24=999\Rightarrow x=999:3=333\)

d) \(...\Rightarrow195-\left(3x-27\right)=4212:39=108\)

\(\Rightarrow\left(3x-27\right)=195-108=87\)

\(\Rightarrow3x=87+27=114\Rightarrow x=114:3=38\)

e) \(...\Rightarrow3\left(x-2\right)=30-18=12\Rightarrow x-2=12:3=4\)

\(\Rightarrow x=4+2=6\)

19 tháng 6 2021

\(a.\left[\left(x+34\right)-50\right].2=56\\ \Leftrightarrow\left(x+34\right)-50=28\\ \Leftrightarrow x+34=78\\ \Rightarrow x=44\)

\(b.1045-\left[215-\left(3x-24\right)\right]=5\\ \Leftrightarrow215-\left(3x-24\right)=1040\\ \Leftrightarrow3x-24=-825\\ \Leftrightarrow3x=-801\\ \Rightarrow x=-267\)

\(c.\left[195-\left(15x-27\right)\right].39=4212\\ \Leftrightarrow195-\left(15x-27\right)=108\\ \Leftrightarrow15x-27=87\\ \Leftrightarrow15x=114\\ \Rightarrow x=7,6\)

 

19 tháng 6 2021

a) [(x+34)] - 50] . 2 = 56

=x+34-50=56:2

=> x+34-50=28

->x=28+50-34

-> x=44

b,1045 - [ 215 - ( 3x - 24 )] = 5

1045-(215-3x+24)=5

1045-215+3x-24=5

1045-215-24-5=-3x

-> 801=-3x-> x=801:(-3)=-267

,c) [ 195 - ( 15x - 27)] . 39 = 4212

(195-15x+27).39=4212

(195-15x+27)=4212/39=108

195+27-108=15x

114=15x-> x=114/15=7,6

 

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6 tháng 8 2023

\(\left[195-\left(3x-27\right)\right]\cdot39=4212\\ \Rightarrow195-\left(3x-27\right)=4212:39\\ \Rightarrow195-\left(3x-27\right)=108\\ \Rightarrow3x-27=195-108\\ \Rightarrow3x-27=87\\ \Rightarrow3x=87+27\\ \Rightarrow3x=114\\ \Rightarrow x=114:3\\ \Rightarrow x=38\)

HQ
Hà Quang Minh
Giáo viên
6 tháng 8 2023

\(\left[195-\left(3x-27\right)\right]\cdot39=4212\\ \Leftrightarrow195-\left(3x-27\right)=108\\ \Leftrightarrow3x-27=87\\ \Leftrightarrow3x=114\\ \Leftrightarrow x=38\)

Vậy x = 38.

12 tháng 12 2021

a, 2x + 12 = 434

2x = 434 - 12 = 422

x = 422 : 2 = 211

b. 25 + 27 ( x - 8 ) = 106

27 ( x - 8 ) = 106 - 25 = 81

x - 8 = 81 : 27 = 3

x = 3 + 8 = 11

20 tháng 9 2023

\(a,91-5.\left(5+x\right)=61\\ \Rightarrow=5.\left(5+x\right)=30\\ \Rightarrow5+x=6\\ \Rightarrow x=1.\\ b,\left[195-\left(3x-27\right)\right].39=4212\\ \Rightarrow195-\left(3x-27\right)=108\\ \Rightarrow3x-27=87\\ \Rightarrow3x=114\\ \Rightarrow x=38.\)

20 tháng 9 2023

\(91-5.\left(5+x\right)=61\)

\(\Rightarrow5.\left(5+x\right)=91-61\)

\(\Rightarrow5.\left(5+x\right)=30\)

\(\Rightarrow5+x=\dfrac{30}{5}=6\)

\(\Rightarrow x=6-5=1\)

\(\left[195-\left(3x-27\right)\right].39=4212\)

\(\Rightarrow195-3x+27=\dfrac{4212}{39}=108\)

\(\Rightarrow222-3x=108\)

\(\Rightarrow3x=222-108=114\)

\(\Rightarrow x=\dfrac{114}{3}=38\)

7 tháng 3 2022

VD: 1/2 là 1 phần 2 đó nha.

 

a: x/3-1/6=1/5

=>x/3=11/30

hay x=11/90

b: =>1/2x=2

hay x=4

c: =>2/3:x=-7-1/3=-22/3

=>x=-1/11

15 tháng 3 2022

\(x=\dfrac{-6.\left(-15\right)}{45}=2\)

15 tháng 3 2022

\(\dfrac{x}{-6}=\dfrac{-15}{45}\)

\(x=\dfrac{\left(-15\right)\cdot\left(-6\right)}{45}\)

\(x=2\)

\(1734:17=102x17:17=102x1=102\)

\(\left(x-7\right)\)\(2-26=13x17-13x7=13\left(17-7\right)=13x10=130\)

\(\left(x-7\right)2=130+26=156\)

\(x-7=156:2=78\)

\(x=78+7=85\)

\(=>x=85\)

\(195-\left(15x+27\right)=4212:39=108\)

\(15x+27=195-108=87\)

\(15x=87-27=60\)

\(x=60:15=4\)

\(=>x=4\)

20 tháng 9 2021

- Tính nhẩm
1734 : 17 = 102

- Tìm x
(x - 7) .2 - 26 = 13.17 - 13.7
(x - 7) .2 - 26 = 13.(17 - 7)
(x - 7) .2 - 26 = 13. 10
(x - 7) .2 - 26 = 130
(x - 7) .2         = 130 + 26
(x - 7) .2         = 156
(x - 7)             = 156 : 2
(x - 7)             = 78
 x                    = 78 + 7
 x                    = 85
___________________
195 - (15x + 27) .39 = 4212         (dấu "[" đặt ở đấu tiên nên không cần thiết)
         (15x + 27) .39 = 195 - 4212
         (15x + 27) .39 = -4017
         (15x + 27)       = -4017 : 39
         (15x + 27)       = -103
          15x                 = -103 -27
          15x                 = -130
              x                 = -130 : 15
              x                 = -26/3
 

2 tháng 11 2016

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K NHA