Dla a= \sqrt{5}- 5 wyznacz |a| oraz oblicz ;3|a|- 3a
a=√5-5
|a|=5-√5
3|a|-3a=3(5-√5)-3(√5-5)=15-3√5-3√5+15=30-6√5
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a=√5-5
|a|=5-√5
3|a|-3a=3(5-√5)-3(√5-5)=15-3√5-3√5+15=30-6√5