Решение:
а) 0,8а³b² • (-5a²b) = 0,8 • (-5) • (a³•a²) • (b²•b) = -4a⁵b³;
б) (-1/3a³b²)² • (3ab⁴)³ = 1/9a⁶b⁴ • 27a³b¹² = 3a⁹b¹⁶.
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Решение:
а) 0,8а³b² • (-5a²b) = 0,8 • (-5) • (a³•a²) • (b²•b) = -4a⁵b³;
б) (-1/3a³b²)² • (3ab⁴)³ = 1/9a⁶b⁴ • 27a³b¹² = 3a⁹b¹⁶.