Zad 15 str 86 zbiór zadań klasa 6 m*n-m+n = m= -2 , n= 3/4 r2+s2-(r+s) r = -3 s=- 2 3x-4xy+x2-y2 x = -3 y= -1 szybko to na jutro !!!! daje naj<3333

r2+s2-(r+s) = (-3)2 + (-2)2 - ( -3 + (-2) ) = 9 + 4 - (-5) = 9+4+5+ 18 3x-4xy+x2-y2 = 3*(-3) - 4 * (-3) * (-1) + (-3)2 - (-1)2 = -9 - 12 + 9 + 1 = -11 m*n - m+n = (-2)*3/4 - (-2)+3/4 = -6/4 - 1 1/4 = - 1 2/4 - 1 1/4 = - 2 3/4