a ) 853 - (2x + 90) : 4 = 356
(2x + 90) : 4 = 853 - 356
(2x + 90) : 4 = 497
2x + 90 = 497 x 4
2x + 90 = 1988
2x = 1988 - 90
2x = 1898
x = 949
e) 853- ( 2x + 90 ) : 4 = 356
( 2x + 90 ) : 4 = 853 - 356
( 2x + 90 ) : 4 = 497
2x + 90 = 497x4
2x + 90 = 1988
2x = 1898
x = 949
Vậy x = 949
853-(2x+90):4=356
(2x+90):4=497
2x+90=1988
2x=1898
x=949
(2x+90) : 4= 853 - 356
(2x+90):4 =497
2x+90 =497x4
2x+90 =1988
2x =1988-90=1898
x =1898:2=949
Vậy x=949
Bài giải
853 - (2x + 90 ) :4 = 356
( 2x + 90 ) : 4= 853 - 356
( 2x + 90 ) :4 = 497
2x + 90 = 497 x 4
2x + 90 =1988
2x = 1988 - 90
2x = 1898
x = 1898 : 2
x = 949
Vậy x =949
P/s : Chúc bạn học giỏi nhé ! :)))
853 - ( 2x + 90 ) : 4 = 356
=> ( 2x + 90 ) : 4 =853 -356
=> ( 2x + 90 ) : 4 =497
=> 2x + 90 =497 x 4
=> 2x + 90 =1988
=> 2x =1988 -90
=> 2x =1898
=>x=1898 :2
=>x =949
853 - ( 2x + 90 ) : 4 = 356
=> ( 2x + 90 ) : 4 =853 -356
=> ( 2x + 90 ) : 4 =497
=> 2x + 90 =497 x 4
=> 2x + 90 =1988
=> 2x =1988 -90
=> 2x =1898
=>x=1898 :2
=>x =949