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ZAD 1.
x = - 6
y = - 2
z = - 3
a)
xy - z = (-6) * (-2) - (-3) = 12 - (-3) = 12 + 3 = 15
b)
4xy - 3xz = 4 * (-6) * (-2) - 3 * (-6) * (-3) = 4 *12 - 3 * 18 = 48 - 48 = 0
c)
xyz - 2 z^{2} = (-6) * (-2) * (-3) - 2 * (-6)^{2} = -36 - 2 * 36 = -36 - 72 = -108
d)
-2xz - 5x^{2} = (-2) * (-6) * (-3) - 5 * (-6)^{2} = -36 - 5 * 36 = -36 -180 = -216
ZAD 4.
a)
x= 6\frac{1}{4} - 5\frac{1}{3} = 6 \frac{3}{12} - 5\frac{4}{12} = \frac{11}{12}
1 > x