- 1教えてください 投稿者:螺李 投稿日:2007年09月12日(水)21時41分36秒
- 2次方程式の利用の文章問題なんですが全然わかりません;
式のつくりかたがわからないので教えてください!
1.全部で20問のクイズをし、1問につき、正解のときは5点、間違いのときはー3点とする。20問終わったとき、得点が60点以上になるには、何問以上正解しなければならないか求めなさい。
2.ある円の半径を2cm長くしたとき、面積が4倍になった。 もとの円の半径は何cmか求めなさい。
2つもすいません; 自分でやってみたんですがよくわかりません;
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