Salut ! :)
a) 1005 + 123 + 95 + 7 = 1005 + 95 + 123 + 7
= 1100 + 130
= 1230
b) 2×25×5×4 = 2×5×25×4
= 10×100
= 1000
c) 103 + 15 + 6 + 7 + 85 = 103 + 7 + 15 + 85 + 6
= 110 + 100 + 6
= 216
d) 4×1725×250×10 = 1725×4×250×10
= 1725×1000×10
= 1725×10000
= 17 250 000
e) 50×22×10×56×0 = 0×50×22×10×56 = 0
Voilà, j'espère t'avoir aidé. :)