Question

ajutați mă dor acele exerciții

Answer 1

IV)
a)  3/5=(3*3)/(5*3)=9/15
9/15=12/20

b) 12/20=(12:2)/(20:2)=6/10
3/5=6/10

c) 3/12=5/20

d) 20/5=12/3


V)
a/1=b/2=c/3   =(a+b+c)(1+2+3)=(a+b+c)/6=60/6=10
a) a+b+c=60 
a=1×10=10
b=2×10=20
c=3×10=30


b)
a/1=b/2=c/3
b=2a
c=3a
3a-b+c=20 
3a-2a+3a=20
4a=20
a=5
b=2a=2×5=10
c=3a=3×5=15