1)5a^6 * (-3a^2 * b)^2=5a^6 * 9a^4 * b^2=45a^10 * b^2
2)(-x^4* y^3)&7 * 8x^2 * y^5 = -x^28 * y^21 * 8x^2 * y^5 = 8x^30 * y^26
3)(0.1a^2 * b * c^5)^2 * 100b * c^4 = 0.1^2 * a^4 * b^2 * c^10 * 100b * c^4=(1/10)^2 * a^4 * b^2 * c^10 * 100b * c ^ 4 = a ^ 4 * b ^ 2 * c^ 10 * b * c^4 = a^4 * b^3 * c^14