Question

-20/27a+1 2/25b-8/39c при a=-0,9; b=5/9; c=3,25​

Answer 1

Объяснение:

-20/27a+1 2/25b-8/39c

при a=-0,9; b=5/9; c=3,25

-20/27*(-9/10)=2/3

1 2/25*5/9=27/25*5/9=3/5

8/39*3,25=8/39*3 1/4=8/39*7/4=14/39

2/3+3/5-14/39=(2*65+3*39-14*5)/195=

=177/195

Answer 2

0.9=9/10

3.25=325/100=13/4

-20/27а+1 2/25b-8/39c=-20/27·-9/10+27/25·5/9-8/39·13/4=2/3+3/5-2/3=3/5