1.
а)
-3а²в * (4,5ав - а²в² - 2) = -13,5а³в² + 3а⁴в³ + 6а²в,
б)
3m * (2 - 4m * (n² - 1) + 5m * (3 - 4n²)) =
= 3m * (2 - 4mn² + 4m + 15m - 20mn²) =
= 3m * (2 - 24mn² + 19m) = 6m - 72m²n² + 57m²,
2.
8 * (z² - 5) - 5z * (z + 8) = 3z² - 11z + 18,
8z² - 40 - 5z² - 40z = 3z² - 11z + 18,
8z² - 40 - 5z² - 40z - 3z² + 11z - 18 = 0,
-29z - 58 = 0,
-29z = 58,
x = -2