Question

rút gọn biểu thức

A=(x=9)-(x-7)-(11-x) 

B=(3x-1)-(2x+2)-(x-3)

 

Answer 1

A= x-9-x+7-11+x

  = x-13

B = 3x-1-2x-2-x+3

    = 0

Answer 2

A=(x+9)-(x-7)-(11-x)

A=x+9-x+7-11+x

A=(x-x+x)+(9+7-11)

A=x+5

B=(3x-1)-(2x+2)-(x-3)

B=3x-1-2x-2-x+3

B=(3x-2x-x)-(1-2+3)=2

Answer 3

A=(x + 9 ) - ( x - 7 ) - ( 11 - x ) 

= x + 9 - x + 7 - 11 + x 

= ( x - x + x ) + ( 9 + 7 - 11 )

=x + 5 

B = ( 3x -1 ) - ( 2x + 2 ) -( x - 3 )

= 3x - 1 - 2x - 2 -x + 3 

=(3x - 2x - x ) - ( 1 - 2 + 3 ) = 2