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-2 i 1/4-1 i 3/5 :(-2 i 2/3)=?
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... = -2 1/4 - 8/5 : (-8/3) =
= -2 1/4 - 8/5 * (-3/8)=
= -2 1/4 + 3/5 =
= -2 5/20 + 12/20 =
= - 45/20 + 12/20 =
= - 33/20 =
= - 1 13/20