3.

а)

2√49 + 3√25 = 2*7 + 3*5 = 14 + 15 = 29,

б)

4√16 - 2√81 = 4*4 - 2*9 = 16 - 18 = -2,

в)

10√(81/100) = 10 * 9/10 = 9,

г)

5√(36/25) = 5 * 6/5 = 6,

д)

100√0,04 - √144 = 100*0,2 - 12 = 20 - 12 = 8,

е)

1 4/7 * √4900 = 11/7 * 70 = 11 * 10 = 110