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= 4½ ÷ (-3) =
= ⁹/₂a × (-⅓) = -³/₂a
(2,4a - 1,6b) ÷ 0,8 =
= 0,8ab ÷ 0,8 = ab
(4u - 6v) ÷ (-½) =
= -2uv ÷ (-½) =
= -2uv × 2 = -4uv