Mathematics
Junior High
この二次式の解き方は平方完成ですか?
2+3.r+1==0
+3.r=-1
デ+3r+(})--1+(})
2
2
2
2
3
x+
2
5
4
3_2
15
=土
X+
2
/5
土
2
3
X =
2
がって
_3±/5
x =
2
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