1
00:00:00,419 --> 00:00:02,573
次の式のうち


2
00:00:02,573 --> 00:00:06,860
x + 2y + x +2 と
等しいのはどれでしょうか

3
00:00:06,860 --> 00:00:09,867
あてはまるものを全て選びなさい
いいでしょう

4
00:00:09,867 --> 00:00:13,281
では これをちょっと操作できるかやってみましょう

5
00:00:13,281 --> 00:00:16,657
こちらに書き直しますしょう

6
00:00:16,657 --> 00:00:21,611
x + 2y + x + 2

7
00:00:21,611 --> 00:00:23,379
まず
これらの選択肢を見る前に

8
00:00:23,379 --> 00:00:24,637
最初に考えつくのは

9
00:00:24,637 --> 00:00:27,299
ここに x があって
こちらにも x がある

10
00:00:27,299 --> 00:00:29,351
もし x が 1

11
00:00:29,351 --> 00:00:32,846


12
00:00:32,846 --> 00:00:34,350


13
00:00:34,350 --> 00:00:37,376


14
00:00:37,376 --> 00:00:40,078


15
00:00:40,078 --> 00:00:43,471


16
00:00:43,471 --> 00:00:46,945


17
00:00:46,945 --> 00:00:49,242


18
00:00:49,242 --> 00:00:51,517


19
00:00:51,517 --> 00:00:54,220


20
00:00:54,220 --> 00:00:57,575


21
00:00:57,575 --> 00:01:00,955


22
00:01:00,955 --> 00:01:03,240


23
00:01:03,240 --> 00:01:05,767


24
00:01:05,767 --> 00:01:10,247


25
00:01:10,247 --> 00:01:13,581


26
00:01:13,581 --> 00:01:15,247


27
00:01:15,247 --> 00:01:16,871


28
00:01:16,871 --> 00:01:17,950


29
00:01:17,950 --> 00:01:20,509


30
00:01:20,509 --> 00:01:22,642


31
00:01:22,642 --> 00:01:25,507


32
00:01:25,507 --> 00:01:28,717


33
00:01:28,717 --> 00:01:32,516


34
00:01:32,516 --> 00:01:37,373


35
00:01:37,373 --> 00:01:40,847


36
00:01:40,847 --> 00:01:42,350


37
00:01:42,350 --> 00:01:43,895


38
00:01:43,895 --> 00:01:46,983


39
00:01:46,983 --> 00:01:49,705


40
00:01:49,705 --> 00:01:51,513


41
00:01:51,513 --> 00:01:56,355