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Sagot :

Bonjour,

Développer:

x²+(5-x/2)(5-x/2)= x²+25-5x/2-5x/2+x²/4= x²+25-10x/2+x²/4= (x²+4*x²)/4- 5x+25

=(5x²/4)-5x+25

ou bien

x²+(5-x/2)(5-x/2)= x²+25-2(5x/2)+x²/4= x²+25-10x/2+x²/4= (x²+4*x²)/4-10x/2+25

                          =  (5x²/4)-5x+25

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