bonsoir,
2)
7/5 -4/15
21/15 - 4/15 = 17/15
=> faux
3)
4x-5 =x+1
4x-x = 1+5
3x= 6
x= 6/3 = 2
x² -2x= 0
4-4 = 0
Vrai
4)
2^3 -1 = 7
2^4 -1 = 15
=> Faux (15 * 5*3)
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bonsoir,
2)
7/5 -4/15
21/15 - 4/15 = 17/15
=> faux
3)
4x-5 =x+1
4x-x = 1+5
3x= 6
x= 6/3 = 2
x² -2x= 0
4-4 = 0
Vrai
4)
2^3 -1 = 7
2^4 -1 = 15
=> Faux (15 * 5*3)