Mathematics
Junior High
Solved
線を引いたところが分かりません
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923
【解説】
HE
(x+1)(y+1)=3, xy+x+y+1=3, xy+x+y=2①EX (+1)
(x+2)(y+2)=5, xy+2(x + y) + 4 = 5, xy+2(x+y)=1201
② ①より, x+y=-1, xy = 3_
(x+5) (y + 5) = xy + 5(x + y) + 25
=3+5X ( - 1) + 25
= 23
0=(ala)(21
.010<
(5)
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