帮我解一下这个题目(关于matlab的)a=[66.8 57.2 78 70 67.4; 75.6 66 67.8 74.2 71; 87 66.4 84.6 69.6 83.8; 58.6 53 59.4 57.2 62.4]a =66.8000 57.2000 78.0000 70.0000 67.400075.6000 66.0000 67.8000 74.2000 71.000087.0000 66.4000 84.6000 69.
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