E=E1-E2=kq1/(r1)^2 - kq2/(r2)^2=
=9*10^9*6.7*10^-9/(3*10^-2)- 9*10^9*13.3&10^-9/(4*10^-2)= ....
ну сам решай с помошю калькулятора
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E=E1-E2=kq1/(r1)^2 - kq2/(r2)^2=
=9*10^9*6.7*10^-9/(3*10^-2)- 9*10^9*13.3&10^-9/(4*10^-2)= ....
ну сам решай с помошю калькулятора