✨ Best Answer ✨
x+y=A と置く
(A-5)²
=A²-10A+25
=(x+y)²-10(x+y)+25 ⇐Aをもとにもどす
=x²+2xy+y²-10x-10y+25
です。
✨ Best Answer ✨
x+y=A と置く
(A-5)²
=A²-10A+25
=(x+y)²-10(x+y)+25 ⇐Aをもとにもどす
=x²+2xy+y²-10x-10y+25
です。
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