1. 56 - (х-15) = 30
х-15 = 56 - 30
х-15 = 26
х = 26 + 15
х = 41
56 - (41 - 15) = 30
30 = 30
ответ: х=41
2. (45 - y) + 18 = 58
45 - y = 58 - 18
45 - y = 40
y = 45 - 40
y = 5
(45 - 5) + 18 = 58
58 = 58
ответ:y = 5
3. (24 + x) - 21 = 10
24 + x = 21 + 10
24 + x = 31
x = 31 - 24
x = 7
(24 + 7) - 21 = 10
10 = 10
ответ: x = 7
Я постарался
56-(x-15)=30 (45-y)+18=58. (24+x)-21=10
(x-15)=56-30. (45-y)=58-18. (24+x=21+10
x-15=26. 45-y=40 24+x=31
x=26+15. y=45-40. x=31-24
x=41 y=5 x=7
1. 56 - (х-15) = 30
х-15 = 56 - 30
х-15 = 26
х = 26 + 15
х = 41
56 - (41 - 15) = 30
30 = 30
ответ: х=41
2. (45 - y) + 18 = 58
45 - y = 58 - 18
45 - y = 40
y = 45 - 40
y = 5
(45 - 5) + 18 = 58
58 = 58
ответ:y = 5
3. (24 + x) - 21 = 10
24 + x = 21 + 10
24 + x = 31
x = 31 - 24
x = 7
(24 + 7) - 21 = 10
10 = 10
ответ: x = 7
Я постарался
56-(x-15)=30 (45-y)+18=58. (24+x)-21=10
(x-15)=56-30. (45-y)=58-18. (24+x=21+10
x-15=26. 45-y=40 24+x=31
x=26+15. y=45-40. x=31-24
x=41 y=5 x=7