Odpowiedź:
1. 2,75
2. 0,(148)
Szczegółowe wyjaśnienie:
1.
[tex]a^{2} +ab - b^{2} = (-2)^{2} +(-2)*(\frac{1}{2}) - (\frac{1}{2})^{2} = 4 + (-1) - (\frac{1}{4}) = 2\frac{3}{4} = 2,75[/tex]
2.
[tex]2x^{2} - 2x^{3} = 2*(\frac{1}{3} )^{2} - 2*(\frac{1}{3} )^{3} = 2*(\frac{1}{9} ) - 2*(\frac{1}{27} ) = \frac{2}{9} - \frac{2}{27} = \frac{2 * 3}{9 * 3} - \frac{2}{27} = \frac{6}{27} - \frac{2}{27} = \frac{4}{27} = 0,(148)[/tex]
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Odpowiedź:
1. 2,75
2. 0,(148)
Szczegółowe wyjaśnienie:
1.
[tex]a^{2} +ab - b^{2} = (-2)^{2} +(-2)*(\frac{1}{2}) - (\frac{1}{2})^{2} = 4 + (-1) - (\frac{1}{4}) = 2\frac{3}{4} = 2,75[/tex]
2.
[tex]2x^{2} - 2x^{3} = 2*(\frac{1}{3} )^{2} - 2*(\frac{1}{3} )^{3} = 2*(\frac{1}{9} ) - 2*(\frac{1}{27} ) = \frac{2}{9} - \frac{2}{27} = \frac{2 * 3}{9 * 3} - \frac{2}{27} = \frac{6}{27} - \frac{2}{27} = \frac{4}{27} = 0,(148)[/tex]