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b=9cm
a)
k=5/6
a'=a*k=12*5/6=2*5=10cm
b'=b*k=9*5/6=15/3=5cm
b)
k=1 1/3=4/3
a'=12*4/3=16cm
b'=9*4/3=12cm
c)
k=0,2
a'=12*0,2=2,4cm
b'=9*0,2=1,8cm
b=9cm
k=1 1/3=4/3
a'=12*4/3=16cm
b'=9*4/3=12cm
c)
k=0,2
a'=12*0,2=2,4cm
b'=9*0,2=1,8cm