全文
例題
5
２つの式を計算するときは，( ）をつけて計算する
次の整式 Aと Bについて，3A＋2B，3A−2B を計算し なさい。
解
A = 3x2 − 2x + 7, B = 4x2 − 3x − 1
3A
3x2− 2x + 7 + 4x2 − 3x − 1
( (
3 2( (
= 9x2 − 6x + 21
= 17x2 − 12x + 19
各式で( )を行う
+8x2 − 6x − 2
3A
3x2 − 2x + 7 − 4x2 − 3x − 1
( (
3 2( (
= 9x2 − 6x + 21
= x2 + 23
−8x2+ 6x + 2
分配法則
日付( 月 日 曜日 ) 名前 ( ）
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