Вычислите: a) 3/√0,81−1/5√2,25; б) 2,4+0,2√9/400; в) (0,6√2)^2

a) 3/(√0.81) = 3/0.9 = 10/3, 1/(5√2.25) = 1/(5*1.5) = 2/15, разность 10/3 - 2/15 = 48/15 - 2/15 = 46/15 ≈ 3.07. б) 2.4 + 0.2√(9/400) = 2.4 + 0.2*(3/20) = 2.4 + 0.03 = 2.43. в) (0.6√2)^2 = 0.36*2 = 0.72.