(-7 1/3+ 8 7/1) ∶ 8/4+(-5 1/4+4 21/40) : 1 9/20 - вопрос №508701471387184514421401920 от violettakot01 03.06.2020 20:54

Question

Математика: (-7 1/3+ 8 7/1) ∶ 8/4+(-5 1/4+4 21/40) : 1 9/20 =

violettakot01 · Answer

(-7 1/3+8 7/1):8/4+(-5 1/4+4 21/40):1 9/20=3 1/3
1). -7 1/3+8 7/1=-7 1/3+8 21/3=8 21/3-7 1/3=1 20/3=23/3
2). -5 1/4+4 21/40=-5 10/40+4 21/40=-1 10/40+21/40=-50/40+21/40=-29/40
3). 23/3:8/4=23/3*4/8=92/24=3 20/24
4). -29/40:1 9/20=-29/40*20/29=-1/2*1/1=-1/2
5). 3 20/24+(-1/2)=3 20/24-12/24=3 8/24=3 1/3