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=⅘+(½-⁸/₁₀)=0,8 + (0,5 -0,8)=0,8+(-0,3)=0,8-0,3=0,5=½
liczba odwrotną do a jest 1/a
½ → 1/½=1:½=1*2=2
przeciwna do a to -a
½ → -½