Oblicz :- (-a2+2ab-1) + (a2 - 4ab = 5 ) a=1/4 b = 2( Te a2 to jest a kwadrat , sorry , że tak napisałem :P )
- (-a2+2ab-1) + (a2 - 4ab + 5 ) = a² - 2ab + 1 + a² - 4ab + 5 = 2a² - 6ab + 6
2a² - 6ab + 6 = 2 * (1/4)² - 6 * 1/4 * 2 + 6 = 2 * 1/16 - 3 + 6 = 1/8 - 3 + 6 = - 2 i 7/8 + 6 = 6 - 2 i 7/8 = 5 i 8/8 - 2 i 7/8 = 3 i 1/8
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- (-a2+2ab-1) + (a2 - 4ab + 5 ) = a² - 2ab + 1 + a² - 4ab + 5 = 2a² - 6ab + 6
2a² - 6ab + 6 = 2 * (1/4)² - 6 * 1/4 * 2 + 6 = 2 * 1/16 - 3 + 6 = 1/8 - 3 + 6 = - 2 i 7/8 + 6 = 6 - 2 i 7/8 = 5 i 8/8 - 2 i 7/8 = 3 i 1/8