Question

[Hà Phương Trần]

a) x ( x + 0 ) = 0

b) ( x - 1 ) ( 7 - x ) = 0

c) ( -x + 5 ) ( 3 - x ) = 0

d) ( x + 5 ) + ( x - 9 ) = 13

e) ( 4 + x ) + ( x - 7 ) = x + 2

f) ( 3x + 5 ) - ( 2x - 7) = 4 - x

g) ( x - 1 )² = 36

h) ( 3 - x ) ³ = -27

Answer 1

[Minh Minh]

a) x ( x + 0 ) = 0

x . x = 0

=> x =0

Answer 2

[Minh Minh]

b) ( x - 1 ) ( 7 - x ) = 0

=> x - 1 =0 hoặc 7 - x = 0

TH1 : x - 1 = 0

x = 0 + 1

x = 1

TH2 : 7 - x = 0

x = 7 - 0

x = 7

Vậy x = 1 hoặc x = 7