Question

Afla numarul necunoscut din epresiile:

e) 36-42 :e : (15 :3-4 :1 ) - 20=10

f) 11-(7 x 5 - 9 x 9 : f : 3 ) : 8 =7

g) 22 - 5 x ( 38 - 4 x g ) =12

h) 26 + ( 6 x h - 7 x 3 ) : 9 =27

Urgent foarte repede dau coroana

Answer 1

36-42 :e : (15 :3-4 :1 ) - 20=10
36-42:e:(5-4)-20 = 10
42:e:1 = 36-20-10
42:e = 6
e = 42:6
e = 7

11-(7 x 5 - 9 x 9 : f : 3 ) : 8 =7
(7 x 5 - 9 x 9 : f : 3 ) : 8 = 11-7
(35-81:f:3):8 = 4
35-81:f:3 = 4×8
35-81:f:3 = 32
81:f:3 = 35-32
81:f:3 = 3
81:f = 3×3
81:f = 9
f = 81:9
f = 9


22 - 5 x ( 38 - 4 x g ) =12
5×(38-4×g) = 22-12
5×(38-4×g) = 10
38-4×g = 10:5
38-4×g = 2
4×g = 38-2
4×g = 36
g = 36:4
g = 9

26 + ( 6 x h - 7 x 3 ) : 9 =27
(6×h-21):9 = 27-26
( 6 x h -21 ) : 9 = 1
6×h-21 = 9×1
6×h = 9+21
6×h = 30
h = 30:6
h = 5