Mathematics
Senior High
Solved
どうやってけいさんしてますか？
+1
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長方形 DFGE の面積は
20-x.x=20
2
ゆえに
整理すると
DF・FG=
x2-20x+40=0
20-x
2
・x
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分かりました！ありがとうございます！