Question

Tìm x , biết :

a , 35 - ( - x + 8 ) = 23 - ( - 7 )

b , 4 -2 . ( x - 3 ) = 3 . ( 3 - x )

Answer 1

* Sửa:

a) 35 - (-x + 8) = 23 - (-7)

35 + x - 8 = 30

35 + x = 30 + 8

35 + x = 38

x = 38 - 35

x = 3

Vậy, x = 3

 

b) 4 - 2(x - 3) = 3 (3 - x)

4 - (2x - 2 . 3) = 3 . 3 - 3x

4 - (2x - 6) = 9 - (2x + x)

4 - 2x + 6 = 9 - 2x - x

(4 + 6) = 9 - x

10 = 9 - x

9 - 10 = x

-1 = x

x = -1

Vậy, x = -1

Answer 2

a/ 35 - ( - x + 8 ) = 23 - ( - 7 )

35 + x +8 = 23 + 7

.......

Answer 3

a) 35 - (-x + 8) = 23 - (-7)

35 + x - 8 = 30

35 + x = 30 + 8

35 + x = 38

x = 38 - 35

x = 3

Vậy, x = 3

 

b) 4 - 2(x-3) = 3(3 - x)

4 - 2x - 2 . 3 = 3 . 3 - 3x

4 - 2x - 6 = 9 - (2x + 1x)

(4 - 6) - 2x = 9 - 2x - 1x

-2 - 2x = 9 - 2x - 1x

-2 = 9 - 1x

x = 9 - (-2)

x = 11

Vậy, x = 11

Answer 4

Mỹ Linh sai câu b rồi nhé

Answer 5

mỹ linh sai câu b òi

Answer 6

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