WEBVTT 00:00:00.990 --> 00:00:05.280 今天要做的是把代数式 4x 加上 18 00:00:05.280 --> 00:00:08.020 分解为两个代数式 00:00:08.020 --> 00:00:08.560 的积。 00:00:08.560 --> 00:00:11.110 我们要做分解因式。 00:00:11.110 --> 00:00:14.030 这项任务的关键是找出 00:00:14.030 --> 00:00:17.420 4x 和 18 之间的公因式。 00:00:17.420 --> 00:00:20.100 00:00:20.100 --> 00:00:21.890 00:00:21.890 --> 00:00:23.690 00:00:23.690 --> 00:00:26.159 00:00:26.159 --> 00:00:28.700 00:00:28.700 --> 00:00:32.299 00:00:32.299 --> 00:00:34.970 00:00:34.970 --> 00:00:37.000 00:00:37.000 --> 00:00:39.280 00:00:39.280 --> 00:00:51.430 00:00:51.430 --> 00:00:54.070 00:00:54.070 --> 00:01:01.660 00:01:01.660 --> 00:01:03.450 00:01:03.450 --> 00:01:04.957 00:01:04.957 --> 00:01:06.540 00:01:06.540 --> 00:01:07.290 00:01:07.290 --> 00:01:09.400 00:01:09.400 --> 00:01:09.900 00:01:09.900 --> 00:01:11.849 00:01:11.849 --> 00:01:13.140 00:01:13.140 --> 00:01:16.660 00:01:16.660 --> 00:01:24.090 00:01:26.690 --> 00:01:29.010 00:01:29.010 --> 00:01:31.102 00:01:31.102 --> 00:01:32.560 00:01:32.560 --> 00:01:34.800 00:01:34.800 --> 00:01:35.765 00:01:35.765 --> 00:01:37.730 00:01:37.730 --> 00:01:41.880 00:01:41.880 --> 00:01:43.350 00:01:43.350 --> 00:01:53.930 00:01:53.930 --> 00:01:59.140 00:01:59.140 --> 00:02:03.260 00:02:03.260 --> 00:02:07.340 00:02:07.340 --> 00:02:09.180 00:02:09.180 --> 00:02:10.949 00:02:10.949 --> 00:02:15.040 00:02:15.040 --> 00:02:15.680 00:02:15.680 --> 00:02:18.000 00:02:18.000 --> 00:02:20.290 00:02:20.290 --> 00:02:23.810 00:02:23.810 --> 00:02:25.802 00:02:25.802 --> 00:02:27.510 00:02:27.510 --> 00:02:30.110 00:02:30.110 --> 00:02:33.379 00:02:33.379 --> 00:02:34.170 00:02:34.170 --> 00:02:43.090 00:02:43.090 --> 00:02:45.970 00:02:45.970 --> 00:02:48.953 00:02:51.580 --> 00:02:57.470 00:02:57.470 --> 00:03:00.200 00:03:00.200 --> 00:03:06.465 00:03:09.440 --> 00:03:11.710 00:03:11.710 --> 00:03:13.380 00:03:13.380 --> 00:03:14.690 00:03:14.690 --> 00:03:17.200 00:03:17.200 --> 00:03:18.640 00:03:18.640 --> 00:03:21.400 00:03:21.400 --> 00:03:23.586 00:03:23.586 --> 00:03:26.992