√2000=√20×10×10
=10√20
=10×4.472
=44.72
√0.02=√2/100
=√2/10×10
=√2×1/10
=1.414×1/10
=14.14
6/√74=6√72/72
=√72/12
=√2×6×6/12
=6√2/12
=√2/2
=√2×1/2
=1.414×1/2
=0.707

最初√(2×10²)でした