Question

Se știe ca a:b=3 b:2=c a-b=40​

Answer 1

Explicație pas cu pas:

a:b=3=>a=3b

b:2=c=>b=2c

dacă a=3b si b=2c=> a=3×2c=6c

a-b=40=> 6c-2c=40=> 4c=40=>c=40:4=10

=>b:2=10=>b=10×2=20

=>a-20=40=>a=40+20=60

=>3a-4b+5c=3×60-4×20+5×10=180-80+50

=100+50=150

Answer 2

a:b=3/•b=>a=3b
b:2=c/•2=>b=2c
a-b=40
3b-b=40
2b=40/:2
b=20
a=3b=3•20=60
b=2c
20=2c/:2
c=10
3a-4b+5c=
3•60-4•20+5•10=
180-80+50=100+50=150