Question

a) 34.(16 - 44) + 44 . (34 - 16)

b) -3 . !x - 1! = -27

Chú ý : ! là dấu giá trị tuyệt đối

Answer 1

b)-3.!x-3!=-27

!x-1!=-27/-3

!x-1!=9

x-1=+-9

TH1 TH2

x-1=9 x-1=-9

x=9+1 x=-9+1

x=10 x=-8

Answer 2

a, = 34.16 - 34.44 + 44.34 - 44.16

= 16.(34 - 44 ) + 44 .( 34 - 34 )

= 16.(-10) + 44.0

= -160

Answer 3

b, ! x-1 ! = -27 : (-3)

! x-1 ! = 9

TH1 : x-1=9 => x= 10

TH2 : x-1 = -9 => x = -8