Спримерами) 1)(1 9/16 * 3 1/5 + 1 2/3 - 9: 2 2/5) - вопрос №6989629119163151239225177126132213 от Alphons145 15.10.2021 16:49

Question

Математика: Спримерами) 1)(1 9/16 * 3 1/5 + 1 2/3 - 9: 2 2/5) : (17 7/12 - 6 1/3)= 2) (2 13/48+2 5/12) : 3 3/4 - 9 3/4 : 12=

Alphons145 · Answer

1)(1 9/16 * 3 1/5 + 1 2/3 - 9: 2 2/5) : (17 7/12 - 6 1/3)=

1 9/16×3 1/5=25/16×16/5=5
9:2 2/5=9×5/12=15/4
5-15/4=20/4-15/4=5/4
5/4+1 2/3=5/4+5/3=15/12+20/12=35/12

17 7/12-6 1/3=11+(7/12-1/3)=11+(7/12-4/12)=
11 1/4=45/4

35/12×4/45=7/27

2) (2 13/48+2 5/12) : 3 3/4 - 9 3/4 : 12=

2 13/48+2 5/12=4+(13/48+20/48)=4 33/48=
225/48
225/48×4/15=15/12=5/4

9 3/4:12=39/4×1/12=39/48=13/16

5/4-13/16=20/16-13/16=7/16