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Let M be a 3×3 matrix satisying M⎡⎢⎣010⎤⎥⎦=⎡⎢⎣−123⎤⎥⎦,M⎡⎢⎣1−10⎤⎥⎦=⎡⎢⎣11−1⎤⎥⎦,and M⎡⎢⎣111⎤⎥⎦=⎡⎢⎣0012⎤⎥⎦.Then, the sum of the diagonal entries of M is ___

Answer» Let M be a 3×3 matrix satisying M⎡⎢⎣010⎤⎥⎦=⎡⎢⎣−123⎤⎥⎦,M⎡⎢⎣1−10⎤⎥⎦=⎡⎢⎣11−1⎤⎥⎦,and M⎡⎢⎣111⎤⎥⎦=⎡⎢⎣0012⎤⎥⎦.

Then, the sum of the diagonal entries of M is ___


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