a) 541 + ( 218 - x ) = 735
218 - x = 735 - 541
218 - x = 194
x = 218 - 194
x = 24
Vậy x = 24
b) ( 5x - 75 ) : 2 - 84 = 201
( 5x - 75) : 2 = 201 + 84
( 5x - 75 ) : 2 =285
5x - 75 = 285 x 2
5x - 75 =570
5x = 570 + 75
5x = 645
x= 645 : 5
x= 129
Vậy x = 129
c) ( 2x + 25 ) . 824 = 826
2x + 32 = 826 : 824
2x + 32 = 82
2x + 32 = 64
2x = 64 - 32
2x = 32
x = 32 : 2
x = 16
Vậy x = 16
a, 541 + ( 218 -x ) = 735
( 218 - x ) = 735 - 541
218 - x = 194
x = 218 - 194
x = 24
b, ( 5x - 75 ) : 2 - 84 = 201
( 5x - 75 ) : 2 = 201 + 84
( 5x - 75 ) : 2 = 285
( 5x - 75 ) = 285 . 2
5x - 75 = 570
5x = 570 + 75
5x = 645
x = 645 : 5
x = 125
c, ( 2x + 25 ) . 824 = 826
( 2x + 25 ) = 826 : 824
2x + 25 = 82
2x + 25 = 26
2x = 26 - 25
2x = 2
x = 2 : 2
x = 1