72•√50+2√18=√3600+2√18=60+2√18;
√25а-√64а+√9а= 5√а-8√а+3√а=0;
(3-√5)²=9-6√5+5=14-6√5.
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72•√50+2√18=√3600+2√18=60+2√18;
√25а-√64а+√9а= 5√а-8√а+3√а=0;
(3-√5)²=9-6√5+5=14-6√5.