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参考です
(1) √50=5√2
=5×(1.414)
=7.070
(2) √500=10√5
=10×(2.236)
=22.36
(3) √5000=50√2
=50×(1.414)
=70.70
(4) √0.5=√(1/2)
=1/√2
=√2/2
=(1.414)/2
=0.707
(5) √0.05=√5×√(1/100)
=(2.236)×(1/10)
=0.2236
(6) √0.005=√1/200
=1/(10√2)
=√2/20
=(1.414)/20
=0.0707