x²-9x+4=0
x1+x2= 9
x1*x2= 4
1/x1 + 1/x2= (x1+x2)/x1*x2= 9/4= 2,25
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x²-9x+4=0
x1+x2= 9
x1*x2= 4
1/x1 + 1/x2= (x1+x2)/x1*x2= 9/4= 2,25