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Physics, 18.10.2020 08:01 thutch1950oww9q0

R=(4.7)^2+(6.6)^2-2.(4.7)+(6.6).(18 0-45)

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R=(4.7)^2+(6.6)^2-2.(4.7)+(6.6).(18 0-45)...
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