Dans les exercices 120 et 121, résoudre dans R chacune
des équations.

120

a. x² - 5x=0

b.-3x²+x=0


c. 4x² = 28x

121 a. (2x - 1) (x + 3) + (x + 5) (2x - 1) = 0

b. 5x (3x+2) = (3x + 2)²
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