(5×10^8)×(3×10^2)
=5*3*10^(8+2)
=15*10^10
=1.5*10^11
a^mb×(-a^3b^2n)
=-a^(m+3)b^(1+2n)
-3(a-b)×(a-b)^2
=-3(a-b)^(1+2)
=-3(a-b)^3
(5×10^8)×(3×10^2)
=5*3*10^(8+2)
=15*10^10
=1.5*10^11
a^mb×(-a^3b^2n)
=-a^(m+3)b^(1+2n)
-3(a-b)×(a-b)^2
=-3(a-b)^(1+2)
=-3(a-b)^3