Ответ:
№5
1) х + 7 • 4 = 40
х + 28 = 40
х = 40 - 28
х = 12
2) 6 • 3 + х = 72
18 + х = 72
х = 72 - 18
х = 54
3)80 - х = 9 • 5
80 - х = 45
-х = 45 - 80
-х = -35
х = 35
4) 12 + х = 5 • 8
12 + х = 40
х = 40 - 12
х = 28
№6
1. (17+13) : 6 = 30 : 6 = 5
2. 28 : 4 + 27 : 3 = 7 + 9 = 16
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Ответ:
№5
1) х + 7 • 4 = 40
х + 28 = 40
х = 40 - 28
х = 12
2) 6 • 3 + х = 72
18 + х = 72
х = 72 - 18
х = 54
3)80 - х = 9 • 5
80 - х = 45
-х = 45 - 80
-х = -35
х = 35
4) 12 + х = 5 • 8
12 + х = 40
х = 40 - 12
х = 28
№6
1. (17+13) : 6 = 30 : 6 = 5
2. 28 : 4 + 27 : 3 = 7 + 9 = 16