Частина 2. Номер 209

45 : 5 + 1 = 10;

45 : 5 • 1 = 9;

543 – 5 • 1 = 538;

(543 – 5) • 1 = 538;

423 + 7 • 0 = 423;

(423 + 7) • 0 = 0;

10 – 0 + 4 = 14;

10 • 0 + 4 = 4.