41、 INCLUDEPICTURE ＼d "https://p.ananas.chaoxing.com/star3/origin/d34b4ae7649e964b7605f876a775e5df.png" ＼* MERGEFORMATINET
(1.0)

3
第2空:

4、

30

3、
已知向量a,b,其中|a|= INCLUDEPICTURE ＼d "http://mooc1-api.chaoxing.com/ananas/latex/p/1895" ＼* MERGEFORMATINET ,|b|=2,且( )⊥a,则向量a和b的夹角是________度.
( )

2、若关于x,y的二元一次方程组 INCLUDEPICTURE ＼d "https://p.ananas.chaoxing.com/star3/origin/5db0c2da95a3c62a2070d895a03ff2c3.png" ＼* MERGEFORMATINET 有非零解,则m= _______
( )

5

2
第2空:

1、在矩阵 INCLUDEPICTURE ＼d "https://p.ananas.chaoxing.com/star3/origin/7716538e2461f2f5b62c9fa4945afa80.png" ＼* MERGEFORMATINET 变换下,点A( )将会转换成____ INCLUDEPICTURE ＼d "https://p.ananas.chaoxing.com/star3/origin/47d4e5845baa911d09c667e915fde116.png" ＼* MERGEFORMATINET ________
( )

80、在一个不透明的袋子中装有4个除颜色外完全相同的小球,其中白球1个,黄球1个,红球2个,摸出一个球不放回,再摸出一个球,两次都摸到红球的概率是( )
(1.0)

79、以A表示事件“甲种产品畅销,乙种产品滞销”,则其对立事件 INCLUDEPICTURE ＼d "https://p.ananas.chaoxing.com/star3/origin/6c633daab7e33d41142bf6962c6f78b1.png" ＼* MERGEFORMATINET 为
(1.0)