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Suzz~Anna
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Pe: 2010-07-16T13:38:33+03:00 In: In:

Sa se…

Ajutati`ma va rog:D

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7 raspunsuri

  1. user (0)

    \rm{a). \frac{x}{y}=1/2 : 1/4=\frac{1}{2} \cdot \frac{4}{1}=2;\\ b).x/y=1\frac{6}{9}:\frac{16-1}{90}=\frac{5}{3}\cdot 6=10 ;\\ c).x/y=1\frac{13-1}{90}:\frac{85}{100}=102/90*100/85=\frac{34 * 20}{30*17}=4/3 ;\\

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  2. user (0)

    \rm{ din a/4=25/b \Rightarrow a\cdot {b}=4*25=100 deci \frac{10*100}{100}=10 ;\\

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  4. user (0)

    \rm{a). x=\frac{2*15}{8}=15/4=3.75 ;\\ b). nu se poate deslusi ce se afla dupa egalitate ...\\ c). daca n=19999*(19999-1)=19999*19998 inlocuim acesta in proportia data si vom avea:\\ 19999*19998/100x=19999/3 de unde x=\frac{\not{19999}*19998*3}{\not{19999}*100}= ...

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  5. expert (VI)

    a).\rm{daca a-b=14 \rightarrow a>b deci raportul lor este \frac{b}{a}=3/4 adica \frac{b}{3}= \frac{a}{4}... =k \Rightarrow a=4k si b=3k\\ de unde avem a-b=14 \Leftrightarrow 4k-3k=14 deci k=14 \{a=4*14=... si\\ b=3*14=... ;
    b).\rm{aici b/a=1/3 adica \frac{b}{1}= \frac{a}{3}... =k deci a=3k si b=k \Rightarrow 4k-k=14 \rightarrow k=14/3\\ avem deci \{a=\not3* \frac{14}{\not3}=14 ;\\ b= 1*\frac{14}{3}=14/3. \\ Aici cred ca exercitiul are o greseala pt.ca 14-14/3\neq14 !\\ Raportul numerelor trebuie sa fie 2/3 !
    c).\rm{aici a/b=81/67 adica \frac{a}{81}= \frac{b}{67}...=k deci\\ a=81k si b=67k \rightarrow 81k-67k=14 adica 14k=14 ; k=1.\\ \Rightarrow a=81*1=81 si b=67*1=67.

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  6. expert (VI)

    \rm{daca \frac{a}{b}= \frac{3}{5} \Rightarrow \frac{a}{3}= \frac{b}{5}= ... k adica a=3k si b=5k\\ \Rightarrow \{a). \frac{3a+b}{2b}= \frac{9k+5k}{10k}=...=1,4;\\ b). \frac{3a+b}{3(3k+5k)}= \frac{14k}{3*8k}=... = \frac{7}{12} ;\\ c). \frac{4a}{4a+7b}= \frac{12k}{47k}= \frac{12}{47}.

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  8. user (0)

    Cristian1990 wrote: \rm{a). x=\frac{2*15}{8}=15/4-3.75 ;\\<br/> b). nu se poate deslusi ce se afla dupa egalitate ...\\<br/> c). daca n=19999*(19999-1)=19999*19998 inlocuim acesta in proportia data si vom avea:\\<br/> 19999*19998/100x=19999/3 de unde x=\frac{\not{19999}*19998*3}{\not{19999}*100}= ... <br/> <br/> <br/>

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  9. user (0)

    andy99 wrote: [quote=Cristian1990]\rm{a). x=\frac{2*15}{8}=15/4=3.75 ;\\ b). nu se poate deslusi ce se afla dupa egalitate ...\\ c). daca n=19999*(19999-1)=19999*19998 inlocuim acesta in proportia data si vom avea:\\ 19999*19998/100x=19999/3 de unde x=\frac{\not{19999}*19998*3}{\not{19999}*100}= ...


    a) Corectie „…=15/4=3,75 „

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