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

m*n-m+n=[latex]-2* frac{3}{4} - 2+ frac{3}{4} [/latex]=-6/4-2/1 +3/4 /*4 =-6-8+3=-11 r2+s2-(r+s)=-3+(-2)×2-(-3+(-2))=-3+(-4)-5=-12 3x-4xy+x2-y2=3×(-3)-4(-3)×(-1)+(-3)×2-(-1)×2=9-(-12)×(-1)+(-6)-(-2)=9-12+(-4)=-3-4=-7