Oblicz Wart.liczbową a) 3(xy)-(2y-x)+7 x=-2 y=1 b) 2m*2mn+n² dla m=½ m=1 c)2(h+1)-(2k-l)+7 Zredukuj wyrazy podobne (y+4)-(2y-3x+1) -3*(2x-y+5) (-2x+y) +(3x-4y) (n-2)-(4m+5n-7) 4(-2x-y+5) -2(xy)-3(x+1)-(y-4)

Zadanie 2. a) (y+4)-(2y-3x+1)= =y+4-2y+3x-1= =3x+y+3 b) -3×(2x-y+5)= =-6+3y-15 c) -(2x+y)+(3x-4x)= =2x-y+3x-4x= =x-y d) (n-2)-(4m+5n-7)= =n-2-4m-5n+7= =-4m-4n+5 e) 4(-2x-y+5)= =-8x-4y+20 f) -2(xy)-3(x+1)-(y-4)= =-2x×(-2y)-3x-3-y+4= =-5x-3y+1