BONJOUR Développe et réduis les expressions suivantes :
=(2−1)2 +(3−1)(1−)
= (4 − 1)(4 + 1) − 5(1 − 3) = 2(3 − 5) + (9 − 7)2
= (5 + 3)(5 − 3) + (2 + 3)2 = (2 + 1)(3 − 5) − ( + 2)2
= ( + 7)(7 − ) + 5(3 − 4
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