oblicz wartość wyrażenia
(x+2y)(x-2y)-4x(x-y)+(x-2y)_2-y
x=0.5
y=-0.5
_oznacza do potegi
x_2-4y_2-4x_2+4xy+x_2-4xy+4y_2-y=
-2x_2+4y_2-4xy-y=
-2(0,5)_2+4(-0,5)_2-4[0,5*(-0,5)]-(-0,5)=
-0,5+1+1+0,5=2
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x_2-4y_2-4x_2+4xy+x_2-4xy+4y_2-y=
-2x_2+4y_2-4xy-y=
-2(0,5)_2+4(-0,5)_2-4[0,5*(-0,5)]-(-0,5)=
-0,5+1+1+0,5=2