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Boiz 10 si 11!
Va rog frumos! VA dau coroana si krabby patty


Boiz 10 Si 11 Va Rog Frumos VA Dau Coroana Si Krabby Patty class=

Răspuns :

Problema 10:

Notații:

kg portocale = p

kg banane = b

[tex]\left \{ {{7b\ +\ 2p\ =\ 66}\ |\ {\cdot}\ (-3) \atop {5b\ +\ 3p\ =\ 55}\ |\ {\cdot}\ 2 \right.{\iff}\left \{ {{-21b\ -\ 6p\ =\ -198} \atop {10b\ +\ 6p\ =\ 110}} \right.\\\\\implies -11b\ =\ -88\\\implies\ \ \ \ \ \ b\ =\ 8\\\\5b\ +\ 3p\ =\ 55\\40\ +\ 3p\ =\ 55\\3p\ =\ 55\ -\ 40\\3p\ =\ 15\\\implies p\ =\ 5[/tex]

R: 1 kg de banane costă 8 lei, iar 1 kg de portocale costă 5 lei.

Problema 11:

Notații:

primul număr - a

al doilea număr - b

[tex]\left \{ {{a-b\ =\ 335} \atop {a\ :\ b\ =\ 12\ r\ 5}} \right. {\iff}\left \{ {{a\ -\ b\ =\ 335} \atop {a\ =\ 12b\ +\ 5}} \right. {\iff}\left \{ {{12b+5 -b\ =\ 335} \atop {a\ =\ 12b\ +\ 5}} \right.{\iff}\left \{ {{11b\ =\ 330} \atop {a\ =\ 12b+5}} \right.  {\iff}\left \{ {{b\ =\ 30} \atop {a\ =\ 365} \right.[/tex]

Proba:

[tex]a-b=335\\365-30=335\ (A)\\\\a:b=12\ r\ 5\\365:30=12\ r\ 5\\{[365=(30{\cdot}12)+5]}\ (A)[/tex]

10

[tex]b = banane[/tex]

[tex]p = portocale[/tex]

[tex]7 \: kg \: b + 2 \: kg \: p = 66 \: lei \: ( \times 3)[/tex]

[tex]5 \: kg \: b + 3 \: kg \: p = 55 \: lei \: ( \times 2)[/tex]

[tex]21 \: kg \: b + 6 \: kg \: p = 198[/tex]

[tex]10 \: kg \: b + 6 \: kg \: p = 110[/tex]

[tex]11 \: kg \: b = 88[/tex]

[tex]b = 8[/tex]

[tex]7 \times 8 + 2 \: kg \: p = 66 \: lei[/tex]

[tex]2 \: kg \: p = 66 - 56[/tex]

[tex]2 \: kg \: p = 10[/tex]

[tex]p = 5[/tex]

11

[tex]a - b = 335[/tex]

[tex]a \div b = 12r5[/tex]

[tex]a = 12b + 5[/tex]

[tex]12 + 5 - b = 335[/tex]

[tex]11b = 335 - 5[/tex]

[tex]11b = 330[/tex]

[tex]b = \frac{330}{11} [/tex]

[tex]b = 30[/tex]

[tex]a - 30 = 335[/tex]

[tex]a = 335 + 30 [/tex]

[tex]a = 365[/tex]

[tex]verificare = 365 - 30 = 335 \: (corect)[/tex]