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2a² + a²b³ - 5a³b² + b² + 5a²b³ + 8a³b² + 12b²
A + B = 2a² + 6a²b³ + 3a³b² + 13b²
b. (A + C) - B
( 2a² + a²b³ - 5a³b² + b² - 7a² + 7a²b³ - 7b²) - ( 5a²b³ + 8a³b² + 12b²)
-5a²+8a²b³-5a³b²-6b²-5a²b³-8a³b²-12b²
(A+C) - B = -5a²+3a²b³-13a³b²-18b²
c. (B-C)-A
[5a²b³ + 8a³b² + 12b² - (-7a² + 7a²b³ -7b²) ] - (2a²+a²b³-5a³b²+b²)
5a²b³ + 8a³b² + 12b² + 7a² - 7a²b³ + 7b² - 2a² - a²b³ + 5a³b² - b²
(B - C) - A = -3a²b³ + 13a³b² + 18b² + 5a²