Bonjour ;
10000000087546
+
88888833357772
--------------------------------
98888833445318
ou bien :
On a : 10000000087546 = 10000000000000 + 87546 ;
et : 88888833357772 = 88888833000000 + 357772 ;
donc : 10000000087546 + 88888833357772
= 10000000000000 + 87546 + 88888833000000 + 357772
= 98888833000000 + 87546 + 357772
= 98888833000000 +445318
= 98888833445318 .