ai trả lời được thì tôi k đúng cho :))

8.2^3x.7^y=56^2x.5^x-1

=>8.8^x.7^y=(8.7)^2x.5^x-1

=>8^1+x.7^y=8^2x.7^2x.5^x-1

=>8^1+x.7^y / 8^2x.7^2x=5^x-1

=>8^x+1-2x . 7^y-2x = 5^x-1

=>8^1-x.7^y-2x=5^-(1-x)

=>8^1-x.7^y-2x=1/5^1-x

=>8^1-x.7^y-2x.5^1-x=1

=>(8.5)^x-1.7^y-2x=1

=>40^x-1.7^y-2x=1

=>x-1=0 và y-2x=0

=>x=1 và y=2

a) 10 - x : 2 = 1

x: 2 = 9

x = 18

b) x:4 + 3 x 2 = 7

x:4 + 6 = 7

x:4 = 1

x = 4

c) 2: x + 5 = 6

2: x = 1

x = 2

+4.10-x:2=1

40-x:2=1

     x:2=40-1

     x:2=39

    x:2=19,5

+5.x:4+3*2=7

5.x:4+6=7

5.x:4=7-6=1

5.x=1.4=4

x=4:5

x=0,8

+6.2:x+5=6

12:x=6-5

12:x=1

x=12:1

x=12

+7.2*x*3*5=30

14.x.15=30

14.x=2

x=2:14

x=1/7

+8.2*x:10*2=1

16.x:20=1

16.x=20

x=20:16

x=1,25

9.18:x-5*2=8

10.5*5-2:x=24

d) 2 * x * 3 * 5 = 30

x * 30 = 30

x = 1

e) 2 * x : 10* 2 = 1

2*x * 1/10 * 2 = 1

2/5 * x = 1

x = 5/2

g) 18 : x - 5*2 = 8

18 : x - 10 = 8

18 : x = 18

x = 1

h) 5*5 -2 : x = 24

25 - 2:x = 24

2:x = 1

x = 2

a) x  -1/4 = -3/8 . 2/5

    x - 1/4 = -3/20

    x        = -3/20 + 1/4

    x        = 1/10

b) x/126 = -7/24 . -6/11

    x/126 = 7/44

\(\Rightarrow\)x = rỗng

a, x- 1/4 = (-3/20) 
   x= 1/10

b, x/126 = (7/44)
    x = 441/22

=> 3x + 1/5 = 136 - 8/10

=> 3x + 1/5 = 125,2

=> 3x = 125

=> x = 125/3

  tick đúng cho mình néh !

vậy cậu giải luôn hộ tớ cái bài lúc này nhé !

`x/8=4/(-32)`

`(4x)/32=(-4)/32`

`4x=-4`

`x=-1`

Vậy `x=-1`.

`b)x-7/18=3 5/12`

`x-7/18=41/12`

`x=41/12+7/18`

`x=137/36`

Vậy `x=137/36`

`c)-3/8. 2/5+(-3)/8. 9/5-(-3)/8. 6/5`

`=-3/8. 2/5-3/8. 9/5+3/8. 6/5`

`=3/8(-2/5-9/5+6/5)`

`=3/8.(-1)`

`=-3/8`

ai tích mình mình tích lại cho

\(4) 10-x:2=1 \)

    \(=> x:2=10-1\)

    \(=> x:2=9\)

    \(=> x=9.2\)

    \(=> x=18\). Vậy \(x=18\)

\(5) x:4+3.2=7\)

\(=> x:4+6=7\)

\(=> x:4=7-6\)

\(=> x:4=1\)

\(=> x=4\). Vậy \(x=4\)

\(6) 2:x+5=6\)

\(=> 2:x=6-5\)

\(=> 2:x=1\)

\(=> x=2\).Vậy \(x=2\)

\(7) 2.x.3.5=30\)

\(=> 2x.15=30\)

\(=>2x=30:15\)

\(=> 2x=2\)

\(=> x=1\).Vậy \(x=1\)

\(8)2.x:10.2=1\)

\(=> 2x=1:2.10\)

\(=> 2x=5\)

 \(=>x=5:2\)

\(=> x=\frac{5}{2}\).Vậy \(x=\frac{5}{2}\)

\(9)18:x-5.2=8\)

\(=> 18:x-10=8\)

\(=>18:x=8+10\)

\(=>18:x=18\)

\(=> x=1\).Vậy \(x=1\)

\(10)5.5-2:x=24\)

\(=>25-2:x=24\)

\(=> 2:x=25-24\)

\(=>2:x=1\)

\(=>x=2\).Vậy \(x=2\)