Question

вычеслите а) 1/12 + 1/10 б) 9/20 - 1/30

Answer 1

$\frac{1}{12} + \frac{1}{10} = \frac{10}{120} + \frac{12}{120} = \frac{22}{120} = \frac{11}{60}$

Answer 2

a)1/12+1/10=(10+12)/120=22/120=11/60
б)9/20-1/30=27/60-2/60=25/60=5/12