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Sagot :

[tex]A) -5 ( \frac{1}{2})^{2} +2 \frac{1}{2} -1=-5 \frac{1}{4} +1-1=-20 [/tex][tex]
B) -5*2²+2*2-1=-5*4+4-1=-20+4-1=-17[/tex]

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