Résoudre dans IR les équations suivantes :
(E1) $\ x^2$-x+1=0
(E2) 3$\ x^2$-x-4=0
(E3) -5$\ x^2$+2$\ \sqrt 5$ x -1 = 0
(E4) -6$\ x^2$-x+2=0
(E5) $\ \sqrt{x-4}$ = 2x-1
(E6) 7$\ x^2$+8x-15=0
(E7) 2$\ x^2$-7x-15=0
(E8) 3$\ x^2$-$\ \sqrt 2$ x+1=0
(E9) $\ \sqrt{2x+6}$ = x-1
(E1) $\ x^2$-x+1=0
(E2) 3$\ x^2$-x-4=0
(E3) -5$\ x^2$+2$\ \sqrt 5$ x -1 = 0
(E4) -6$\ x^2$-x+2=0
(E5) $\ \sqrt{x-4}$ = 2x-1
(E6) 7$\ x^2$+8x-15=0
(E7) 2$\ x^2$-7x-15=0
(E8) 3$\ x^2$-$\ \sqrt 2$ x+1=0
(E9) $\ \sqrt{2x+6}$ = x-1
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