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- 155{\displaystyle {\sqrt {15}}\times {\sqrt {5}}} 155=75{\displaystyle 15\times 5=75}. 155=75{\displaystyle {\sqrt {15}}\times {\sqrt {5}}={\sqrt {75}}}.
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- 75{\displaystyle {\sqrt {75}}} 253{\displaystyle {\sqrt {25\times 3}}} 25 ( 5):
75{\displaystyle {\sqrt {75}}}
= 253{\displaystyle {\sqrt {25\times 3}}}
= 53{\displaystyle 5{\sqrt {3}}}
- 75{\displaystyle {\sqrt {75}}} 253{\displaystyle {\sqrt {25\times 3}}} 25 ( 5):
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- 612{\displaystyle 6{\sqrt {12}}} 643{\displaystyle 6{\sqrt {4\times 3}}}
- 4 ( 2) 6:
612{\displaystyle 6{\sqrt {12}}}
= 643{\displaystyle 6{\sqrt {4\times 3}}}
= 623{\displaystyle 6\times 2{\sqrt {3}}}
= 123{\displaystyle 12{\sqrt {3}}}
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