设[tex=7.429x2.786]tAg4kjefm91yBdigy4ffjM4OG8pWTp/Pq6CzCEg07PHxvSYMUepw5x98OFTBpo3hulYxZPgZM0zOO1LW2mhgUlrUo07Elv+31vCAVjPV4JM=[/tex],其中[tex=2.714x1.214]cedd0oO+gfBQG4sDRZAPZQ==[/tex]分别是[tex=0.5x0.786]U5O66aolbR1y5vuKrQbXNA==[/tex]级、[tex=0.5x0.786]BgHR5DBWke5rTEC5XEckiQ==[/tex]级方阵,证明:[tex=0.786x1.0]ri6gmnf1+J9dGqG5/1sV6A==[/tex]可逆当且仅当[tex=2.714x1.214]cedd0oO+gfBQG4sDRZAPZQ==[/tex]都可逆,并且当[tex=0.786x1.0]ri6gmnf1+J9dGqG5/1sV6A==[/tex]可逆时,有[tex=9.786x3.357]gFM2A/BG46GBgNRZ7upd5wQ8pmMQEoKDTMt6IZ8jpMR9sW8OkCpCVz+r5gVvWFy4Zq0/ZKSHfwVpTwBDZqlfPlqhqu2nQfVRDdy+rrq35+UwUthU1cy9KzPA0L3JNUef[/tex].
举一反三
- set1 = {x for x in range(10)} print(set1) 以上代码的运行结果为? A: {0, 1, 2, 3, 4, 5, 6, 7, 8, 9} B: {0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10} C: {1, 2, 3, 4, 5, 6, 7, 8, 9} D: {1, 2, 3, 4, 5, 6, 7, 8, 9,10}
- >>>x= [10, 6, 0, 1, 7, 4, 3, 2, 8, 5, 9]>>>print(x.sort()) 语句运行结果正确的是( )。 A: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10] B: [10, 6, 0, 1, 7, 4, 3, 2, 8, 5, 9] C: [10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0] D: ['2', '4', '0', '6', '10', '7', '8', '3', '9', '1', '5']
- 【计算题】5 ×8= 6×4= 7×7= 9×5= 2×3= 9 ×2= 8×9= 7×8= 5×5= 4×3= 5+8= 6 ×6= 3×7= 4×8= 9×3= 1 ×2= 9×9= 6×8= 8×0= 4×7=
- 已知a=[1 2 3; 4 5 6; 7 8 9],执行命令:a([3,1],:)=a([1,3],:),a将变为( )。 A: [4 5 6;4 5 6;4 5 6] B: [7 8 9;4 5 6;1 2 3] C: [2 2 2;5 5 5;8 8 8] D: [3 2 1;6 5 4;9 8 7]
- 下面说法错误的是( )。知识点:列表推导式 A: dict([(x, x**2) for x in range(6)]) 创建的字典是{0: 0, 1: 1, 2: 4, 3: 9, 4: 16, 5: 25} B: [[x*3+y for y in range(1,4)] for x in range(3)] 创建的是二维列表 [[1, 2, 3], [4, 5, 6], [7, 8, 9]] C: number = [-2, 4, 6, -5]string = 'ab'z = [(i, j) if i>0 else (-i, j) for i in number for j in string]这段代码创建的列表为[(2, 'a'), (2, 'b'), (4, 'a'), (4, 'b'), (6, 'a'), (6, 'b'), (5, 'a'), (5, 'b')] D: ' '.join([i for i in range(1,11)])的运算结果为字符串'1 2 3 4 5 6 7 8 9 10'