Х+450=700, 280-а=190, х*30=60, 240: х=80

X + 450 = 700

x = 700 - 450

x = 250

250 + 450 = 700

700 = 700


280 - a = 190

a = 280 - 190

a = 90

280 - 90 = 190

190 = 190


x × 30 = 60

x = 60 ÷ 30

x = 2

2 × 30 = 60

60 = 60


240 ÷ x = 80

x = 240 ÷ 80

x = 3

240 ÷ 3 = 80

80 = 80

Х+450=700. Х=700-450.х=250.280-а=190.а=280-190.а=90.х•30=60 х=60:30 х=20.240:х=80 х=240:80 х=3