1到20的算术平方根都告诉我.

1到20的算术平方根如下：

$\sqrt{1} = 1$

​=1

$\sqrt{2} \approx 1.414$

​≈1.414

$\sqrt{3} \approx 1.732$

​≈1.732

$\sqrt{4} = 2$

​=2

$\sqrt{5} \approx 2.236$

​≈2.236

$\sqrt{6} \approx 2.449$

​≈2.449

$\sqrt{7} \approx 2.646$

​≈2.646

$\sqrt{8} = 2\sqrt{2} \approx 2\times1.414 = 2.828$

​=22

​≈2×1.414=2.828

$\sqrt{9} = 3$

​=3

$\sqrt{10} \approx 3.162$

​≈3.162

$\sqrt{11} \approx 3.317$

​≈3.317

$\sqrt{12} = 2\sqrt{3} \approx 2\times1.732 = 3.464$

​=23

​≈2×1.732=3.464

$\sqrt{13} \approx 3.606$

​≈3.606

$\sqrt{14} \approx 3.742$

​≈3.742

$\sqrt{15} \approx 3.873$

​≈3.873

$\sqrt{16} = 4$

​=4

$\sqrt{17} \approx 4.123$

​≈4.123

$\sqrt{18} = 3\sqrt{2} \approx 3\times1.414 = 4.243$

​=32

​≈3×1.414=4.243

$\sqrt{19} \approx 4.359$

​≈4.359

$\sqrt{20} = 2\sqrt{5} \approx 2\times2.236 = 4.472$

​=25

​≈2×2.236=4.472