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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 6: a) (x-5)+2x=16 b) x-(4x+13)=2 c) 12-4x+(x-8)=-14 d) -(2x-3)+(4+x) =0 e) 3x+27-2(x-4)=-13×195+13×95 f) (x-1)+(x-2)+…+(x-100)=2750 Giú

Toán Lớp 6: a) (x-5)+2x=16
b) x-(4x+13)=2
c) 12-4x+(x-8)=-14
d) -(2x-3)+(4+x) =0
e) 3x+27-2(x-4)=-13×195+13×95
f) (x-1)+(x-2)+…+(x-100)=2750
Giúp mik với

Comments ( 1 )

  1. $ a) ( x-5)+2x=16⇒x-5+2x=16⇒3x-5=16 $ 
    $ 3x=16+5=21⇒x=21:3=7 $ 
    $ b) x-(4x+13)=2⇒x-4x-13=2 $ 
    $ -3x-13=2⇒-3x=2+13=15⇒x=15:(-3)=-5 $ 
    $ c) 12-4x+(x-8)=-14 ⇒ 12-4x+x-8=-14 $ 
    $ 4-(-3x)=-14⇒4+3x=-14⇒3x=-14-4=-18⇒x=-18:3=-6 $
    $ d) -(2x-3)+(4+x) =0 ⇒-2x+3+4+x=0 ⇒ -x+7=0⇒-x=-7⇒x=7 $ 
    $ e) 3x+27-2(x-4)=-13.195+13.95=-13.[195+(-95)]=-13.100=-1300 $
    $ 3x+27-2x-8 =-1300⇒x+19=-1300⇒x=-1300-19=-1319 $ 

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222-9+11+12:2*14+14 = ? ( )