Bonjour,
1)
-1
-1*4 = -4
-4 +8 = 4
4*2 = 8
2)
à l'envers:
30
30-8 = 22
22/4 = 5,5
3)
2(4x+8) = (4+x) ² -x²
8x +16 = 16+8x +x² -x²
8x+ 16 = 8x+16
Vrai
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Bonjour,
1)
-1
-1*4 = -4
-4 +8 = 4
4*2 = 8
2)
à l'envers:
30
30-8 = 22
22/4 = 5,5
3)
2(4x+8) = (4+x) ² -x²
8x +16 = 16+8x +x² -x²
8x+ 16 = 8x+16
Vrai
15-8=7
7/4=1,75