(40-c:3)×2=68
a×8+124=300
1000-63:b=991


Răspuns :

( 40 - c : 3 ) × 2 = 68

( 40 - c : 3 ) = 68 : 2

40 - c : 3 = 34

c : 3 = 40 - 34

c : 3 = 6

c = 6 × 3

c = 18

a × 8 + 124 = 300

a × 8 = 300 - 124

a × 8 = 176

a = 176 : 8

a = 22

1000 - 63 : b = 991

63 : b = 1000 - 991

63 : b = 9

b = 63 : 9

b = 7