14 Résoudre chacun des systèmes :
1
x+y=10
xy=21
2
1/x+1/y=8/15
xy = 15
3
x² + y² = 40
xy=12
4
x^2+y^2=5
x+y=3
1
x+y=10
xy=21
2
1/x+1/y=8/15
xy = 15
3
x² + y² = 40
xy=12
4
x^2+y^2=5
x+y=3
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