✨ Best Answer ✨
1 + 2 +…+999
999+998+...+ 1
————————
1000+1000+…1000
になるので、1000×(999÷2)=1000÷2×999=500×999=499500 だと思います
you are god
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ごめんなさい。1000×(1000÷2)=1000×500=500000でした…