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2014-11-05T17:12:33+02:00
A)Yy ^{-1} = \frac{5}{7} * \frac{7}{5} =1

B)x+y= \frac{2}{7} + \frac{5}{7}= \frac{7}{7}  =1

C)x-y= \frac{2}{7} - \frac{5}{7}=- \frac{3}{7}

D) x^{2} = (\frac{2}{7} )^{2}=(\frac{2^{2}}{7^{2}} )=\frac{4}{49}
(-24 supra 10)*(6 supra 9)=-8 supra 5=-1,6
Determinati opusul numarului rational a=
\frac{5}{8} - \frac{5}{9} * 0.3
\frac{5}{8} - \frac{5}{9} * 0.3=\frac{5}{8}-\frac{5}{9}*\frac{3}{10}=\frac{5}{8}-\frac{1}{6}=\frac{5*3-4}{24}=\frac{11}{24} 0pusul este -\frac{11}{24}
Determinati inversul numarului rational a=1,125*[1+0.(3)]
a= 1,125 *(1+ \frac{3}{9} )=1,125 *\frac{3+1}{3}= \frac{1125}{1000} * \frac{4}{3} =\frac{375}{250}=\frac{3}{2} inversul numarului rational este: [tex]\frac{2}{3}[/tex]