Răspuns:
Salut !
[tex]\frac{9}{4}+\frac{8}{4}=\frac{9+8}{4}=\frac{17}{4}=4\frac{1}{4}\\ \\\frac{9}{8}-(\frac{7}{8}-\frac{6}{8})=\frac{9}{8}-\frac{1}{8}=\frac{7}{8}\\[/tex]
[tex]\frac{2}{10}+\frac{8}{10}+\frac{5}{10}+\frac{1}{10}=\frac{2+8+5+1}{10}=\frac{16}{10}=\frac{8}{5}\\ \\\frac{x}{y} \frac{16}{100}-(\frac{13}{100}+\frac{2}{100}-\frac{4}{100})=\frac{16}{100}-\frac{11}{100}=\frac{5}{100}=\frac{1}{20}[/tex]
Cel mai mic numar de 3 cifre impare diferite : 135
Latura rombului : 135 : 3 = 45
Perimetrul rombului : 45 x 4 = 180
Bafta !
