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{{1,2,3,4},{0,5,6,7},{0,0,8,9},{0,0,0,10}}.{{1,-2/5,-3/40,-21/400},{0,1/5,-3/20,-1/200},{0,0,1/8,-9/80},{0,0,0,1/10}}
{{1,2,3,4},{0,5,6,7},{0,0,8,9},{0,0,0,10}}.{{1,-2/5,-3/40,-21/400},{0,1/5,-3/20,-1/200},{0,0,1/8,-9/80},{0,0,0,1/10}}
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