Mathematics
Junior High
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(3)の解説教えてください🙇♀️
答え 13
1 x+y= -5,xy=3のとき, 次の式の値を求めよ。
(1) x² + y²
(x+y)+24g
(-5)2-6
(2) (x+2)(y+2)
XY + 2x + 21 +4
144
f
x y + 2 [ x + Y] +4
(3) (x-y)2
2
3+-10+4
x=2xy + y²
6
25-6
19
-3
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