a) $$2a^5b^2 \cdot ba^3 = 2a^{5+3}b^{2+1} = 2a^8b^3$$
б) $$(-0,1x^3)^4 \cdot 10x = (-0,1)^4 \cdot (x^3)^4 \cdot 10x = 0,0001x^{12} \cdot 10x = 0,001x^{12+1} = 0,001x^{13}$$
a) $$3a^2b \cdot b^4a^4 = 3a^{2+4}b^{1+4} = 3a^6b^5$$
б) $$(-0,2x^2)^3 \cdot 5x^2 = (-0,2)^3 \cdot (x^2)^3 \cdot 5x^2 = -0,008x^6 \cdot 5x^2 = -0,04x^{6+2} = -0,04x^8$$
Ответ: a) $$2a^8b^3$$, б) $$0,001x^{13}$$, a) $$3a^6b^5$$, б) $$-0,04x^8$$