180 - х = 100
- х = 100-180
- х = -80
х=80
х - 17 = 40
х = 40+17
х = 57
х + 24 = 50
х = 50-24
х =26
15 • 10 + (30 - 20) • 5 = 200
15 • 10 + 30 - 20 • 5 = 80
(120 + 320 : 4) • 2 = 400
(120 + 320) : (4 • 2) =55
180 - х = 100
- х = 100-180
- х = -80
х=80
х - 17 = 40
х = 40+17
х = 57
х + 24 = 50
х = 50-24
х =26
15 • 10 + (30 - 20) • 5 = 200
15 • 10 + 30 - 20 • 5 = 80
(120 + 320 : 4) • 2 = 400
(120 + 320) : (4 • 2) =55