Odpowiedź:
a. 5x+6y=5•(-2)+6•4=-10+24=14
b. 6x-xy=6•5-5•(-2)=30+10=40
c. 1/2x+y²=1/2•(-8)+(-2)²=-4+4=0
d. 2xy-2y²=2•4•(-1/2)-2(-1/2)²=-4-1/2=-4 1/2
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Odpowiedź:
a. 5x+6y=5•(-2)+6•4=-10+24=14
b. 6x-xy=6•5-5•(-2)=30+10=40
c. 1/2x+y²=1/2•(-8)+(-2)²=-4+4=0
d. 2xy-2y²=2•4•(-1/2)-2(-1/2)²=-4-1/2=-4 1/2