Question

Efetue:
a)-(3,2×10^6)+(1,4×10^7)=
b)-(5,32×10^4)-(2,23×10^3)=
c)-(2,1×10^4)×(3,21×10^-6)=
d)-(4,2×10^-3)÷(2,0×10^-5)=

Answer 1

a)-(3,2×10^6)+(1,4×10^7)=
   -(3,2×1000000)+(1,4×10000000)
   - 3200000 + 14000000 = 10800000 ou ainda = 1,08 x 10^7
 
b)-(5,32×10^4)-(2,23×10^3)= -55430 ou ainda = -5,543 x 10^4
c)-(2,1×10^4)×(3,21×10^-6)= - 0,06741 
d)-(4,2×10^-3)÷(2,0×10^-5)= -210