a,11-(15+21)=x-(25-9)

      11-15-21=x-25+9

               -x=-25+9-11+15+21

               -x=9

                x=-9

b,9-25=(7-x)-(25+7)

    -16=7-x-32

      x=7-32+16

     x=-9

9 – 25 = (7-x) – (25 + 7)

9 + (-25) = 7 – x – 25 – 7

-16 = 7 – x – 25 – 7

X = 7 – 7 – 25 + 16

x = -25 + 16

x = -9

a, x-(17-x)=x-7

x-17+x = x-7

(x+x) - 17 = x - 7

2x - 17 = x - 7

2x - x = -7 + 17

1x = 10

x = 10

vậy_____

b, 9-25 = (7-x)-25+7

-16 = 7-x - 25 + 7

-16 = 7-x - (25-7)

-16 = 7-x - 18

-16 + 18 = 7 - x

2 = 7- x

2 - 7 = x

-5 = x

vậy____

x - ( 17 - x ) = x - 7

x - 17 + x = x - 7

x + x - x = 17 - 7

x = 10

9 - 25 = ( 7 - x ) - 25 +7

-16 = 7 - x - 25 + 7 

- 16 = 7 - 32 - x 

- 16 = -25 - x

x = - 25 - ( - 16 )

x = -9

a, x-(17-x)=x-7

x-17+x = x-7

(x+x) - 17 = x - 7

2x - 17 = x - 7

2x - x = -7 + 17

1x = 10

x = 10

x=10

b, 9-25 = (7-x)-25+7

-16 = 7-x - 25 + 7

-16 = 7-x - (25-7)

-16 = 7-x - 18

-16 + 18 = 7 - x

2 = 7- x

2 - 7 = x

-5 = x

Trả lời:

\(a,\)\(-9-25=\left(7-x\right)-\left(-25+7\right)\)

        \(\Leftrightarrow-34=7-x-\left(-18\right)\)

        \(\Leftrightarrow-34=7-x+18\)

        \(\Leftrightarrow-34=25-x\)

                 \(\Leftrightarrow x=59\)(Thỏa mãn \(x\inℤ\))

Vậy x = 59

\(b,\)\(x-\left(17-x\right)=x-7\)

       \(\Leftrightarrow x-17+x=x-7\)

             \(\Leftrightarrow2x-17=x-7\)

                           \(\Leftrightarrow x=10\)(Thỏa mãn\(x\inℤ\))

Vậy x = 10

Banh Bao Tong

9 - 25 = ( 7 - x ) - ( 25 + 7 )

-16     =  ( 7 - x ) - 32

-16 + 32 = 7-x

16      = 7 - x

x = 7 - 16

x = -9

nếu mk đúng k mk nha mn ủng hộ mk nhé kb đi

9-25=(7-x)-(25+7) 

(-16)=( 7-x )-32

(-16) +32=7-x

16          = 7-x

7-16       =x

-9           = x

vậy x= -9

^_^

9 - 25 = (7 - x) - (25 + 7)

- 16 = 7 - x - 32

x = 7 - 32 + 16

x = - 9

9-25=(7-x)-(25+7)

-16=(7-x)-32

=>(7-x)=32-(-16)

7-x=48

x=7-48

x=-41

a, 11 - ( 15 + 11 ) = x - ( 25 - 9 )

11-15-11=x-25+9

-15=x-16

x=1

b, 2 - x = 17 - ( - 5 )

2-x=22

x=-20

c, x - 12 = ( - 9 ) - 15

x-12=-24

x=-12

d, 9 - 25 = ( 7 - x ) - ( 25 + 7 )

(7-x)-32=-16

7-x=16

x=-9

#H

-9 , ủng hộ mk nha

Ừ! Đúng là bằng -9 nhưng các bạn phải viết cả cách làm ra

Theo đầu bài ta có:
9 - 25 = ( 7 - x ) - ( 25 + 7 )
=> -16 = 7 - x - 32
=> -16 = -25 - x
=> x = ( -25 ) - ( -16 )
=> x = -9

(7-x)-32=-16

7-x=-16+32

7-x=16

x=7-16

x=-9

 9 -25 = (7-x) - ( 25 +7)

 - 16 = 7 -x - 32

x = 7 -32 +16 

x =7 -16

x = - 9