Question

Me ajudem por favor e para amanha

Answer 1

3.

a) $3,2\times 10^6+2,8\times 10^6=(3,2+2,8)\times 10^6=6\times 10^6$

b) $32,3\times 10^4-2,1\times 10^4=(32,3-2,1)\times 10^4=30,2\times 10^4$