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17.1=1.9×9 を利用して、
√17.1=√1.9×√9=3√1.9

0.19=19/100 を利用して
√0.19=√19/10

√17.1-√0.19
=3√1.9-√19/10
=3×1.38-4.36÷10
=4.14-0.436
=3.704

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