( 1,2 - 4 3/8 ) - ( 5 1/16 - 1,8 ) = ( 1 1/5 - 4 3/8 ) - ( 5 1/16 - 1 4/5 ) =

= ( 1 8/40 - 4 15/40 ) - ( 5 5/80 - 1 64/80 ) = - 3 7/40 - ( 4 85\80 - 1 64/80 )=

= - 3 7/40 - 3 21/80 = - 3 14/80 - 3 21/80 = - 6 35/80 = - 6 7/16.

Ответ: - 6 7/16.

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p.s. Надеюсь, помогла))