December 2020 2 145 Report
Bonjour,je n'arrive pas à faire cet exercice où il faut developper et réduire ces équations :

1 : (t-1)(t+1)+(5+t)(t-2)
2:(4+2x)x(4-2x)
3: 4(1-7y)+(4y-5)(y-1)
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