Вправи 301 - 400 » 359 (7-8)

7) (0,4 • 3)–8 • 0,058 = x • 6–8; (1,2)–8 • (5/100)8 = x • 6–8; (12/10)–8 • (20/1)–8 = x • 6–8; ((12•20)/10)–8 = x • 6–8; 24–8 = x • 6–8; x = (24/6)–8 = 4–8. 8) 24–13 = x • 2–26 • 3–13; (3 • 8)–13 = x • 2–26 • 3–13; 3–13 • 8–13 = x • 2–26 • 3–13 |: 3–13; 8–13 = x • 2–26; (23)–13 = x • 2–26; 2–39 = x • 2–26; x = 2–39 : 2–26; x = 2–13.