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Hello

ko thích làm

a, \(231-\left(x-6\right)=1339:13\)

\(\Leftrightarrow231-\left(x-6\right)=103\)

\(\Leftrightarrow x-6=128\)

\(\Leftrightarrow x=134\)

Vậy .....

b, \(70-5\left(2x-3\right)=45\)

\(\Leftrightarrow5\left(2x-3\right)=25\)

\(\Leftrightarrow2x-3=5\)

\(\Leftrightarrow2x=8\)

\(\Leftrightarrow x=4\)

Vậy ....

c, \(156-\left(x+61\right)=82\)

\(\Leftrightarrow x+61=74\)

\(\Leftrightarrow x=13\)

Vậy ....

d, \(6\left(5x+35\right)=330\)

\(\Leftrightarrow5x+35=55\)

\(\Leftrightarrow5x=20\)

\(\Leftrightarrow x=4\)

Vậy ......

e, \(936-\left(4x+24\right)=72\)

\(\Leftrightarrow4x+24=864\)

\(\Leftrightarrow4x=840\)

\(\Leftrightarrow x=210\)

Vậy ...

231-(x-6)=1339:13

237-x=103

=>x=237-103=134

Vậy x=134

70-5(2x-3)=45

70-10x+15=45

=>-10x=45-15-70=-40

=>x=4

Vậy x=4

Các caau sau tương tự nhé bn

a, 231 - ( x - 6 ) = 1339 : 13

231 - ( x -6 ) = 103

x - 6 = 231 - 103 = 128

x = 128 + 6 = 134

b, 70 - 5 (2x -3 ) = 45

5 ( 2x -3 ) = 70 - 45 = 25

( 2x -3 ) = 25 : 5 = 5

2x = 5 + 3 = 8

x = 8 : 2 = 4

c, 156 - ( x + 61 ) = 82

x + 61 = 156 - 82 =74

x = 74 - 61

x = 13

d, 6 ( 5x + 35 ) = 330

5x + 35 = 330 : 6 = 55

5x = 55 - 35 = 20

x = 20 : 5 = 4

e, 936-(4x+ 24 ) = 72

4x + 24 = 936 - 72 = 864

4x = 864 - 24 = 840

x = 840 : 4 = 210

Chuc ban hoc tot nhe

\(y\cdot6+y\cdot4=70\)

\(\Leftrightarrow y\cdot\left(6+4\right)=40\)

\(\Leftrightarrow10y=70\)

\(\Leftrightarrow y=7\)

`yxx6+yx4=70`
`yxx(4+6)=70`
`yxx10=70`
`y=70:10`
`y=7`

`yxx6+yxx4=70`
`yxx(4+6)=70`
`yxx10=70`
`y=70:10`
`y=7`

a) \(70-5\left(2x-3\right)=45\)

\(70-10x+15=45\)

\(-10x=45-70-15\)

\(-10x=-40\)

\(x=4\)

vay \(x=4\)

 b) \(156-\left(x+61\right)=82\)

\(x+61=156-82\)

\(x+61=74\)

\(x=74-61\)

\(x=13\)

vay \(x=13\)

c) \(6\left(5x+35\right)=330\)

\(30x+210=330\)

\(30x=330-210\)

\(30x=120\)

\(x=4\)

vay \(x=4\)

d) \(936-\left(4x+24\right)=72\)

\(4x+24=936-72\)

\(4x+24=864\)

\(4x=864-24\)

\(4x=840\)

\(x=210\)

vay \(x=210\)

\(70-5.\left(2x-3\right)\)\(=45\)

\(5.\left(2x-3\right)\)\(=\)\(70-45\)

\(5.\left(2x-3\right)\)\(=25\)

\(2x-3=25:5\)

\(2x-3=5\)

\(2x=8\)

\(x=8:2\)

\(x=4\)

\(156-\left(x+61\right)\)\(=82\)

\(x+61=156-82\)

\(x+61=74\)

\(x=74-61\)

\(x=13\)

\(6.\left(5x+35\right)\)\(=330\)

\(5x+35=330:6\)

\(5x+35=55\)

\(5x=55-35\)

\(5x=20\)

\(x=20:5\)

\(x=4\)

\(936-\left(4x+24\right)\)\(=72\)

\(4x+24=936-72\)

\(4x+24=864\)

\(4x=864-24\)

\(4x=840\)

\(x=840:4\)

\(x=210\)

Tìm x :

a) 70 - 5 . ( 2x - 3 ) = 45

           5 . ( 2x - 3 ) = 70 - 45

           5 . ( 2x - 3 ) = 25

                    2x - 3 = 25 : 5

                    2x - 3 = 5

                         2x = 5 + 3

                         2x = 8

                           x = 8 : 2

                           x = 4

b)    156 - ( x + 61 ) = 82

                     x + 61 = 156 - 82

                     x + 61 =  74

                             x = 74 - 61

                             x = 13

c) 6 . ( 5x + 35 ) = 330

             5x + 35 = 330 : 6

             5x + 35 = 55

                     5x = 55 - 35

                     5x = 20

                       x = 20 : 5 

                       x = 4

d) 936 - ( 4x + 24 ) = 72

                  4x + 24 = 936 - 72

                  4x + 24 = 364

                          4x = 364 - 24

                          4x = 340

                            x = 340 : 4

                            x = 85

Mình chỉ biết làm câu 1 thui

5x-2y=4y=3z-4y

5x= 4y+2y=3z-4y

5x=6y=3z-4y

5x=-3z=-4y-6y

5x=-3z=10y

Vì ba số này bằng nhau nén mình có thể đổi vị trí được

=>5x=10y=-3z

=>(5+10-3).(x+y-z)

=>12.70

=840

b) 231−(x−6)=1339:13231−(x−6)=1339:13\

231−(x−6)=103231−(x−6)=103

x−6=231−103=128x−6=231−103=128

x=128+6=134

b, \left(32.15\right):2=\left(x+70\right):14-40(32.15):2=(x+70):14−40

\Rightarrow\left(x+70\right):14-40=480:2⇒(x+70):14−40=480:2

\Rightarrow\left(x+70\right):14=240+40=280⇒(x+70):14=240+40=280

\Rightarrow x+70=3920\Rightarrow x=3850⇒x+70=3920⇒x=3850

c, x-4867=\left(175.2050.70\right):25+23x−4867=(175.2050.70):25+23

\Rightarrow x=39462500:25+23+4867⇒x=39462500:25+23+4867

\Rightarrow x=1578500+23+4867=1583390⇒x=1578500+23+4867=1583390

c=20

các bạn giúp mình nhanh với

mình tịck cho

cảm ơn bạn rất nhiều!nhờ có bạn mà mình đã hoàn thành bài.

một lần nữa rất cảm ơn bạn!

5(x-3)=70-45=25

x-3=5

x=8

\(\Leftrightarrow5\left(x-3\right)=25\\ \Leftrightarrow x-3=5\\ \Leftrightarrow x=8\)

\(3\left(5^x-1\right)-2=70\\ \Rightarrow3.5^x-3-2=70\\ \Rightarrow3.5^x-5=70\\ \Rightarrow3.5^x=75\\ \Rightarrow5^x=25\\ \Rightarrow x=2\)

\(3.\left(5^x-1\right)-2=70\)

\(\Leftrightarrow3.\left(5^x-1\right)=70+2\)

\(\Leftrightarrow3.\left(5^x-1\right)=72\)

\(\Leftrightarrow5^x-1=72:3\)

\(\Leftrightarrow5^x-1=24\)

\(\Leftrightarrow5^x=24+1\)

\(\Leftrightarrow5^x=25\)

\(\Leftrightarrow5^x=5^2\)

\(\Leftrightarrow x=2\)

Vậy \(x=2\)