| Lets invert the matrix: | |
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1- Press 1/X or type INV ( [ 2 , 3 ] [ 4 , 5 ] )
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2- Press [ ENTER ] |
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3- it will show the inverse matrix  |
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Remember the "," between numbers. Here coma is used as separator, not as fraction mark.
HP49G uses "." as fraction mark, according to the default flag.
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