✨ Best Answer ✨
b=a+1
c=a+6
d=a+7
bc-ac
=(a+1)(a+6)-a(a+7)
=a^2+7a+6-a^2-7a
=6
よって成り立つ。
✨ Best Answer ✨
b=a+1
c=a+6
d=a+7
bc-ac
=(a+1)(a+6)-a(a+7)
=a^2+7a+6-a^2-7a
=6
よって成り立つ。
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