Question

Tìm x :
a)504 : (16 - 3x) = 72
b)272 - (4x + 15) = 45
c)(x : 23 + 45) x 67 = 8911
d)[ (x + 32) - 17] x 2 = 42

Answer 1

b)

272 - (4x + 15) = 45
=> 4x + 15 = 272 - 45
=> 4x + 15 = 227
=> 4x = 227 - 15
=> 4x = 212
=> x = 212 : 4
=> x = 53

d)

[(x + 32) - 17].2 = 42

    [(x + 32) - 17]  = 21

     x + 32 = 21 + 17

     x + 32 = 38

     x = 6

Answer 2

b)

272 - (4x + 15) = 45
=> 4x + 15 = 272 - 45
=> 4x + 15 = 227
=> 4x = 227 - 15
=> 4x = 212
=> x = 212 : 4
=> x = 53

d)

[(x + 32) - 17].2 = 42

    [(x + 32) - 17]  = 21

     x + 32 = 21 + 17

     x + 32 = 38

     x = 6