iv) (la + mb): (lc + md) :: (la - mb): (lc -md)
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Step-by-step explanation:
la+mb+LC+MD/LC+md-la+MB=la-mb+lc-md/lc-md-la+MB
l(a+c)m(b+d)/l(a+c)m(b+d)=l(a+c)-m(b+d)/l(a+c)-m(d+b)
(l+m)(a+c)(b+d)/(l+m)(a+c)(b+d)=(l-c)(a+c)(b+d)/(l-c)(a+c)(d+b).
1=1
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