a) x^2-3y+2x^2+5y+x^2-y = x= -1/2 y= 3/5
b) -2xy+2x-3y+6xy+x-2y= x= -3 y= -1/2
c) 2x^2y^2-5xy+x^2y^2+2xy-4xy= x= 1/3 y= -2
^2 oznacza do potęgi liczby 2. no że np:
3^2 czyli 3 do potegi drugiej.
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a) x²-3y+2x²+5y+x²-y = 4x²+y
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4x²+y dla x= -1/2 y= 3/5
4(-1/2)²+3/5=4*1/4+3/5=3/5
b) -2xy+2x-3y+6xy+x-2y=4xy+3x-5y
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4xy+3x-5y dla x= -3 y= -1/2
4*(-3)*(-1/2)+3*(-3)-5*(-1/2)=-12*(-1/2)-9+2,5=6-9+2,5=-0,5
c) 2x²y²-5xy+x²y²+2xy-4xy=3x²y²-7xy
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3x²y²-7xy dla x= 1/3 y= -2
3(1/3)²(-2)²-7(1/3)(-2)=1/3*4-7*(-2/3)=1 1/3+4 2/3=6