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2)(2√2)²+(3√2)²=c² 4·2+9·2=c² 8+18=c² 26=c² c=√26
3)4²+b²=(5√5)² 16+b²=125 b²=125-16 b²=109 b=√109
4)a²+(5√2)²=(3√2)² a²+50=108 a²=58 a=√58