Oblicz:
a) (⅚ + 1½) : (⁵/₇ - 1⅖)=
b) 1⅖ * 12 ¹/₇ - 3 ⅓ * (4 ²/₁₁ - 3 ½) =
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a) (⅚ + 1½) : (⁵/₇ - 1⅖)=(5/6+3/2):(5/7-7/5)=(5/6+9/6):(25/35-49/35)=14/6:(-24/35)=
14/6 · (-35/24)= - 245/72 i 29/72
b)
1⅖ * 12 ¹/₇ - 3 ⅓ * (4 ²/₁₁ - 3 ½) = 7/5·85/7-10/3·(46/11-7/2)=17-10/3·(92/22-77/22) =
17 - 10/3· 15/22 =17- 25/11=17-2 i 3/11 =14 i 8/11