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a)
2/|AB|=3/(3+6)
|AB|=x
2/x = 3/9
2/x = 1/3
x= 2*3/1
x=6
b)
|CD|=y
4,5/y=7,2/(7,2+2,4)
4,5/y = 7,2/9,6
y= 4,5*9,6/7,2
y=43,2/7,2=6
c)
|EF|=z
2/z = 3/(3+4+5)
2/z = 3/12
2/z = 1/4
z = 2*4/1
z = 8