1. √49=7 √0,36=√9/25=3/5
√400=20 √0,04= √1/25=1/5
√1600=40 √1/81=1/9 √9/49= 3/7 √1=1
2. 1)3√4-√49= 3*2-√49=3*2-7 = 6-7 = - 1
2) √64: √900 = 8: 30 = 8/30сократить= 4/15
3) √0,09-2√16 = √9/100-2√16 = √9/16 -2*4 = 3/10 - 2*4= 3/10 - 8= -77/10 = -7 7/10
4) √13^2-4*6^ = √169-4*36 (все под знаком корень) = √169-144 (все под корнем) =√25= 5
5) 2^2-5√0.36= 4-5√9/25 = 4-5* 3/5 = 4-3=1
6) 3/8 * √6400 -71 = 3/8 * 80-71 = 3*10 -71 = 30-71 = -41