1. Calculer les expressions suivantes : H = 2x + 3x - 5                                                      I = (7x - 3x) + (-4x -2) - ( -2 )                                                       J = 8x - (2x + 3x) - ( 4x + 1 ) + x 2. Simplifier au maximum les nombres suivants en écriture fractionnaire. a. 30/42 b. 450/245 c. 98/126 d. 51/68
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