Mathematics
Senior High
赤線のところがなぜあるのかわからないです💦解説お願いします🙏
316 111 X+Y = 2₁ XY=259
2
x² + y² = (x²7x3² - 2x²7²
= [(X+Y)-22Y] = 2 (2Y)²
= -8
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