А) 9 5/21- (10 2/3-3 5/28)= б) 6 13\15+ 3 7\12- 4 9\20=

Question

А) 9 5/21- (10 2/3-3 5/28)= б) 6 13\15+ 3 7\12- 4 9\20=

Answer 1

9 5/21-(10 2/3-3 5/28=9 5/21-(7+56/84-15/84)=9 5/21-7 41/84=2+20/84-41/84=2-21/84=2-1/4=1 3/4

6 13/15+3 7/12-4 9/20=5+(13/15+7/12-9/20)
=5+52/60+35/60-27/60=5 60/60=6