Răspuns:
Pentru a scădea doua fracții, aducem la un numitor comun...
g) [tex]\frac{21}{3ori7^{2} } -\frac{46 }{7^{2}ori23 } = \frac{21}{147} -\frac{46}{1127} = \frac{23667}{165669} -\frac{6762}{165669} =\frac{16905}{165669} = \frac{5635}{55223}[/tex]
h)[tex]1\frac{55}{33} -1\frac{77}{66} =\frac{85}{33} - \frac{143}{66} =\frac{5610-4719}{2178} =\frac{891}{2178}[/tex]
i) [tex]1\frac{888}{777} -2\frac{555}{999}=\frac{1665}{777} -\frac{2553}{999} =\frac{1663335-1983681}{776223} =-\frac{320346}{776223}[/tex]
