x=-3\over4 y=1\over3 a)2x^2-4y\over15xy= b)15xy-2x^2\over3y^2= c)2x+7y-xy\over8x^2 = Dam 6.

a) 2 (-3/4) do kwadratu - 4 * 1/3 // 15 * (-3/4)*1/3 = 2 * 9/16 - 4/3 // 15 * (-1/4)= 9/8 - 4/3 // (-15/4)= 27/24 - 32/24 // -15/4 = -5/24 // -15/4= (-5/24) * (-4/15)= 1/18 //- kreska ułamkowa

b) 13 (-3/4) * 1/3 - 2 (-3/4) do kwadratu // 3* (1/3) do kwadratu = 15* (-1/4) -2 *9/168 // 3* 1/9= (-15/4) - 9/8 // 1/3= -30/8- 9/8 // 1/3= -39/8 //1/3= -39/8 * 3= 117/8 = 14 5/8

c) 2 *( -3/4) + 7* 1/3 - (-3/4)(1/3) // 8* (-3/4) do kwadratu = (-3/2) = 7/3 - (-1/4) // 8* 9/16= -3/2 +7/3 +1/4 // 9/2= -18/12 + 28/12 +3/12 // 9/2 = 13/12 : 9/2= 13/12* 2/9 = 13/54

a2#-3/4-4#1/3 kreska 15#-3/4#1/3=2#9/16-4/3 kreska -5/4=-10/48:-5/4=-10/48#-4/5=1/6

b15#-3/4#1/3-2#-3/4^2kreska 3#1/3^2=-5/4-2#9/16kreska3#1/9=-5/4-18/16kreska3/9=-38/16#9/3=7całych i 3/4

c tak jak podała ewalcia 22