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(3/20 - 5/20)÷ ½= -¾ - 6 × (-2/20) ÷ ½ = -¾ - (-12/20) ÷ ½ = -15/20 - (-12/20) ÷ ½ = -15/20 - (-12/20) × 2/1 = -15/20 - (-24/20) = -15/20 + 24/20 = 9/20
Mam nadzieję, że pomogłam !
Powodzenia :)