Odpowiedź :
[tex]a) 6x - xy\\x = 4, y=-2\\6*4 - 4*(-2)= 24 + 8= 32\\b) \frac{1}{2} x+y^2\\x= -8\\y = -2\\\frac{1}{2} *(-8)+(-2)^2= -4 + 4= 0\\c) 4xy-2y^2\\x=4\\y=\frac{1}{2} \\4*4*\frac{1}{2}-2*(\frac{1}{2})^2=8-\frac{1}{2}=7\frac{1}{2}[/tex]
[tex]a) 6x - xy\\x = 4, y=-2\\6*4 - 4*(-2)= 24 + 8= 32\\b) \frac{1}{2} x+y^2\\x= -8\\y = -2\\\frac{1}{2} *(-8)+(-2)^2= -4 + 4= 0\\c) 4xy-2y^2\\x=4\\y=\frac{1}{2} \\4*4*\frac{1}{2}-2*(\frac{1}{2})^2=8-\frac{1}{2}=7\frac{1}{2}[/tex]