Verified answer

Ответ:

а) 15/22

б) 29/60

в) 53/60

г) 133/225

Пошаговое объяснение:

а) 4/11 + 7/22 = 8/22 + 7/22 = 15/22

б) 9/12 - 4/15 = 45/60 - 16/60 = 29/60

в) 13/15 - 7/20 + 11/30 = 52/60 - 21/60 + 22/60 = 53/60

г) 41/45 - 0,32 = 41/45 - 32/100 = 41/45 - 820/900 - 288/900 = 532/900 = 266/450 = 133/225

Ответ:

4.a [tex]\frac{4}{11} +\frac{7}{22} =\frac{8}{22} +\frac{7}{22} =\frac{8+7}{22} =\frac{15}{22}[/tex]

4.б [tex]\frac{9}{12} -\frac{4}{15} =\frac{45}{60} -\frac{16}{60} =\frac{45-16}{60} =\frac{29}{60}[/tex]

4.в [tex]\frac{13}{15} -\frac{7}{20} +\frac{11}{30} =\frac{52}{60} -\frac{21}{60} +\frac{22}{60} =\frac{52-21+22}{60} =\frac{53}{60}[/tex]

4.г [tex]\frac{41}{45} -0,32 =\frac{41}{45} - \frac{32}{100} =\frac{41}{45} -\frac{8}{25} =\frac{205}{225} -\frac{72}{225} =\frac{205-72}{225}=\frac{133}{225}[/tex]