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

а где второй

Answer 3

??

Answer 4

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