a) (x-32).45=0
( x - 32 ) = 0 : 45
( x -32 ) = 0
x = 0 + 32
x = 32
b) 25.(52-x)=25
( 52 - x ) = 25 : 25
( 52 - x ) = 1
=> x = 52 - 1 = 51
c) 231+(312-x)=531
( 312 - x ) = 531 - 231
( 312 - x ) = 300
x = 312 - 300
x = 12
d) ( 7x-15):3=2
( 7x - 15 ) = 2x 3
( 7x - 15 ) = 6
7x = 6 + 15
7x = 21
=> x = 21 :7
x = 3
a) (x-32).45=0
x - 32 = 0
x = 0 + 32
x = 32
b) 25.(52-x)=25
52 - x = 25 : 25
52 - x = 1
x = 52 - 1
x = 52
a, ( x - 32 ) . 45 = 0
( x - 32 ) = 0 : 45
x - 32 = 0
x = 0 + 32
x = 32
b, 25 . ( 52 - x ) = 25
( 52 - x ) = 25 : 25
52 - x = 1
x = 52 - 1
x = 51
c, 231 + ( 312 - x ) = 531
( 312 - x ) = 531 - 231
312 - x = 300
x = 312 - 300
x = 12
d, ( 7x - 15 ) : 3 = 2
( 7x - 15 ) = 2 x 3
7x - 15 = 6
7x = 6 + 15
7x = 21
x = 21 : 7
x = 3
a) (x-32).45=0
(=)x-32=0
=>x=0
b)25.(52-x)=25
52-x =25:25
52-x =1
c)231+(312-x)=531
312-x =531-231
312-x =300
x =312-300
x =12
d)(7x-15):3=2
7x-15 =2.3
7x-15 =6
7x =6+15
7x =21
x =21:7
x =3
=>lớp mấy mà ko giải nổi mấy bài này!v~