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b) 5a^2*6a - 8b * 6a - 6b*10a - 7a^2*10a - 3ab = 30a^3 - 48ab - 60ab -7a^3 - 3ab= 23a^3- 111ab
c) (8r^3 - ax^2 y^2 - 3x^2 y^2*2 - 4x^3*2) * -2x^ y^2 = 8r^3-4x^2 y^2-6x^2 y^2-8x^3*2x^2 y^ = 8r^3-20x^4 y^4 - 8x^3
d) 4c - c*2 + 3*2 - 3 (c-4*+2c*3+8) = 4c-2c+6-3c-12+6c+8 = 5c+12-12 = 5c