б)x × 10 = 1600 + 200x × 10 = 1800x = 180
100 × x = 12000 - 7000100x = 5000x = 50
x ÷ 10 = 3400 + 1900x ÷ 10 = 5300x = 5300 × 10x = 53000
96800 ÷ x = 5840 - 574096800 ÷ x = 100x = 96800 ÷ 100x = 968
б)
x × 10 = 1600 + 200
x × 10 = 1800
x = 180
100 × x = 12000 - 7000
100x = 5000
x = 50
x ÷ 10 = 3400 + 1900
x ÷ 10 = 5300
x = 5300 × 10
x = 53000
96800 ÷ x = 5840 - 5740
96800 ÷ x = 100
x = 96800 ÷ 100
x = 968