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#NB :
1,7. 10^-8 = 17 . 10^-9
r^2 = 1/4 x d^2 => 1/4 x 7 mm x 7mm, 7 mm = 7 x 10^-3
77 cm = 77 x 10^-2
√24⇒8282ω
∉h +×÷3 = 344,88