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Ajutati-ma va rog la 2 exercitii la matematica:
1)Aflati numarul rational, a ,stiind ca :
a) | a |=3,1
b)| a |= 5 pe13
c)| a |=0
d)| a |=2,(3)
e)| a |= -1intreg 1pe3
f)| a |=0,99

2)Reprezentati pe axa,numerele care au modulul egal cu:
a) 2,5
b)1 pe 2
c) 3intreg 1pe4

Răspuns :

0000000
[tex]|a|=3,1 \longrightarrow a= \pm \frac{31}{10} \\ |a|= \frac{5}{13} \longrightarrow a= \pm \frac{5}{13} \\ |a|=0 \longrightarrow a=0 \\ |a|=2,(3) \longrightarrow a= \pm 2 \frac{1}{3} \\ |a|=1 \frac{1}{3} \longrightarrow a= \pm \frac{4}{3} \\ |a|=-1 \frac{1}{3} \longrightarrow imposibil \\ |a|=0,99 \longrightarrow a= \pm \frac{99}{100} \\ \\ a)\underline{~~~~~~~~~~-2,5~~~~~~~~~~0~~~~~~~~~~2,5~~~~~~~~~~~~~} \\ b)\underline{~~~~~~~~~~~~~~~~~~- \frac{1}{2} ~~~0~~~~ \frac{1}{2} ~~~~~~~~~~~~~~~~~~~} [/tex]

[tex]3 \frac{1}{4}= \frac{13}{4}= \approx 3 \\ c)\underline{~~~~~~~~~~~~~~~- 3\frac{1}{4} ~~~~~~~~~~0~~~~~~~~~~3 \frac{1}{4} ~~~~~~~~~~~~~~~~~}[/tex]

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