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dit x->g : 0?
m1/m2: r^2/x^2-r^2
25/400:5^2/x^2-5^2
1/16 : 25/x^2-25
x^2-25 : 16.25
x^2-25 : 400
x^2 : 400 + 25
x^2 : 20^2 + 5^2
x : 20 + 5
x : 25