Question

[I Love You]

Tìm x thuộc Z:

a) 311 - x + 82 = 46 + ( x -21 )

b) - ( x - 3 + 85 ) = ( x + 70 - 71 ) - 5

c) ( -x + 821 + 534 ) = 499 + ( x - 84 )

d) x + 96 = ( 443 - x ) - 447

Answer 1

[Nguyen Bao Linh]

a) 311 - x + 82 = 46 + (x - 21)

311 - x + 82 = 46 + x - 21

-x - x = 46 - 21 - 311 - 82

-2x = -368

x = -368 : (-2)

x = 184

b) -(x - 3 + 85) = (x + 70 - 71) - 5

-x + 3 - 85 = x + 70 - 71 - 5

-x - x = 70 - 71 - 5 - 2 + 85

-2x = 77