Вычислите 1/5-2/15+1/30; 3/20+7/10-3/40; 9/40+3/4-19/20

Question

Вычислите 1/5-2/15+1/30; 3/20+7/10-3/40; 9/40+3/4-19/20

Answer 1

1/5-2/15+1/30=6/30-4/30+1/30=2\30+1\30=3\30 =1\10

3/20+7/10-3/40=6/40+28/40-3/40=34\40-3\40=31\40

9/40+3/4-19/20=9/40+30/40-38/40=39\40-38\40=1\40