√0.25 +0.3 0.5 + 0.3 0.8 -----------------= ---------------= ---------- = 8/10 : 9/10 =8/10 * 10/9 = 8/9 √0.81 0.9 0.9
√0.25+0.3:√0.81=0.5+0.3:0.9=0.8:0.9=≈0.8(8)