5

5（五）是46之间的自然数，是第3個質數

5
 ← 4 5 6 →
 数表 — 整数 <<  0 1 2 3 4 5 6 7 8 9 >>

fifth

3 - 5 - 7

5

数学性质

基本运算

${\displaystyle {{5}\times {x}}}$  5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 125 150 250 500 750 5000

${\displaystyle 5\div x}$  5 2.5 ${\displaystyle 1.{\overline {6}}}$  1.25 1 ${\displaystyle 0.8{\overline {3}}}$  ${\displaystyle 0.{\overline {7}}1428{\overline {5}}}$  0.625 ${\displaystyle 0.{\overline {5}}}$  0.5 ${\displaystyle 0.{\overline {4}}{\overline {5}}}$  ${\displaystyle 0.41{\overline {6}}}$  ${\displaystyle 0.{\overline {3}}8461{\overline {5}}}$  ${\displaystyle 0.3{\overline {5}}7142{\overline {8}}}$  ${\displaystyle 0.{\overline {3}}}$
${\displaystyle x\div 5}$  0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 2.8 3

${\displaystyle {{5}^{x}}}$  5 25 125 625 3125 15625 78125 390625 1953125 9765625 48828125 244140625 1220703125 6103515625 30517578125
${\displaystyle {{x}^{5}}}$  1 32 243 1024 3125 7776 16807 32768 59049 100000 161051 248832 371293 537824 759375

参考文献

1. ^ 优等生必学的速算技巧大全. 清華大學出版社. 2018 [2019-05-02]. ISBN 9787302463214. （原始内容存档于2019-08-18）.
2. ^ Royal Society of Chemistry - Visual Element Periodic Table. [2012-10-14]. （原始内容存档于2016-04-10）.