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文字式の計算
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文字式の計算
1.
高認数学
文字式の計算
2.
文字式とは 文字の入った式のことを文字式という。 なぜ文字式を使う? 値段=120× a
文字a はりんごの個数を表す。 文字を使う事で、具体的な個数が決まら ない場合でも、 りんごの値段を 式であら わせる。 公式が作れる!
3.
代入 文字に「数」や「文字」を当てはめることを 代入という。 文字式 120× a (×は省略 ⇒
120a) [サンプル] 文字式 120a の文字aに数を代入! a=1のとき 120a=120×1=120 a=2のとき 120a=120×2=240 a=5のとき 120a=120×5=600
4.
代入
5.
項と係数 加法の記号(+)で結ばれているものそれぞれを項とい う。文字を含む項で数字の部分を係数という。
2a+3
6.
文字式のルール
7.
文字式の計算 文字の部分が同じ項を同類項という。文字式の計算の ポイントは同類項を見つけること! サンプル
2a+3a=(2+3)a =5a
8.
文字式の計算
9.
単項式と多項式 数や文字についての乗法だけであらわされた式を 単項式という。単項式の和の形であらわされた式を 多項式という。数だけの項を定数項という。 サンプル
単項式:3a , -2xy 定数項 多項式:x+y , 2a+1
10.
式の次数 単項式で、かけ合わされている文字の個数を、その単項 式の次数という。多項式では各項の次数のうちで最も大き いものを、その多項式の次数という。 次数が1の式を1次式、次数が2の式を2次式という。 サンプル
11.
式の展開 カッコのある多項式の積の式をカッコをはずして単項式 の和の形にすることを展開という。 サンプル
1 2 a(b+c)=ab+ac 1 2 (a+b)(c+d)=ac+ad+bc+bd 3 4
12.
式の展開
13.
解答
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