1. а)√324=18, √3,61=1,9, √81/196=9/14, √1 64/225=1 8/15
б) (√7)²=7, -(√15)²=-15, (√4)∧4=16
в) (2√7)²=4*7=28, -2(√(-7)²)=-2*7=-14, (-2√7)∧4=16*49=784
г)√676-√576=26-24=2, √9/25*√6,25=3/5*2,5=3/5*25/10=3/2
2. х²=169, х=√169=13
х²=13, х=√13
√х=13, х=13²=169