Răspuns:
cmmmc (25; 90) = 2 × 3² × 5² = 450 numitorul comun
¹⁸⁾1/25+⁵⁾1/90=18/450+5/450=23/450
[tex] \bf\red{ \dfrac{23}{450} }[/tex]
Explicație pas cu pas:
[tex] \bf \dfrac{^{18)} 1 \: }{25} + \dfrac{^{5)} 1 \: }{90} = \dfrac{18}{25 \cdot18} + \dfrac{5}{90\cdot5} = \dfrac{18 + 5}{450} = \red{ \dfrac{23}{450} }[/tex]
