вычисли 3целых 3/10+9/20:9/12=

3 3/10 + 9/20 : 9/12 = 3 9/109/20 : 9/12 = 9/20 × 12/9 = 1/5 × 3/1 = 3/53 3/10 + 3/5 = 3 3/10 + 6/10 = 3 9/10

3 3/10+ 9/20:9/12= 33/10+ 9/20*12/9 = 33/10 + 3/5= 33 +6 /10 = 39/10 = 3 9/10