zadanie 2159 oblicz wartość wyrażenia jeśli a=-4
b ) 2a*I a-3 I
c ) I a I *I 3a-2 I
Oblicz wartość wyrażenia c=-√5
a) II 1+c I + c I
b ) I -1-I 2-c II
c) 1 - I 3c + I2c-4II
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a = -4
b) 2a·Ia-3I = 2·(-4)·I-4-3I = -8 ·I-7I = -8·7 = -56
c) IaI ·I3a-2I = I-4I ·I3·(-4) -2I = 4·I-12-2I = 4· I-14I = 4·14 = 56
c=-√5
a) I I1+cI +cI = I I1-√5I -√5I = I -1+√5 -√5 I = I-1I = 1
b) I -1-I 2-cI I = I -1-I2+√5I I = I -1 -(2+√5) I = I-1-2-√5I = I-3-√5I=3 + √5
c) 1 - I3c + I2c-4I I = 1 - I3·(-√5) + I2·(-√5)-4I I = 1 - I -3√5 + I-2√5-4I I = 1- I-3√5+2√5+4I=
= 1 - I4-√5I = 1- (4-√5) = 1-4+√5 = √5 -3