a.
670 - x : 6 = 94 *6
suy ra 670 - x:6 = 564
suy ra x:6 = 670 - 564
suy ra x:6 = 106
suy ra x = 106*6
suy ra x = 636
b.
x : ( 927 : 9 - 100 ) = 12850
suy ra x : (103 - 100) = 12850
suy ra x : 3 = 12850
suy ra x = 12850 *3 = 38550

a ) 670 - x : 6 = 94 *6
b ) x : ( 927 : 9 - 100 ) = 12850
c ) 18 * y +y + y = 4 * 250
d ) 14 * y - y * 3 - y = 430
Giải :
a) 670-x:6= 94*6 => 670 - x:6 = 564 => x : 6 = 670 - 564 => x : 6 = 106 => x = 106 * 6 => x = 636
b) x : ( 927 : 9 -100 ) = 12850 => x : 3 = 12850 => x = 12850 * 3 => x = 38550
c) 18y + y + y = 4 * 250 => 20y = 1000 => y = 1000 : 20 => y = 50
d) 14y - 3y - y = 430 => 10y = 430 => y = 430 : 10 => y = 43