S:P18.12: Difference between revisions
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''Reconstituiți înmulțirea <math>\overline{abc} \times 3 = \overline{bcc}</math>.'' | ''Reconstituiți înmulțirea <math>\overline{abc} \times 3 = \overline{bcc}</math>.'' | ||
Soluție. | '''Soluție.''' | ||
Notăm prin <math>u\left( N \right)</math> ultima cifră a numărului natural <math>N</math>. | Notăm prin <math>u\left( N \right)</math> ultima cifră a numărului natural <math>N</math>. | ||
Avem ''<math>\overline{abc} \times 3 = \overline{bcc} \Rightarrow 300a+30b+3c=100b+11c \Rightarrow 300a = 70b + 8c</math>'' | |||
Revision as of 12:08, 16 December 2024
S:P18.12 (Vasile Berinde)
Reconstituiți înmulțirea Failed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle \overline{abc} \times 3 = \overline{bcc}} .
Soluție.
Notăm prin Failed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle u\left( N \right)} ultima cifră a numărului natural Failed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle N} .
Avem Failed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle \overline{abc} \times 3 = \overline{bcc} \Rightarrow 300a+30b+3c=100b+11c \Rightarrow 300a = 70b + 8c}