a: CM*CA*BN*BA
=CH^2*BH^2=AH^4
b: CM*BN*AH
=BH^2/AB*CN^2/AC*AH
=AH^3
d: BN/CM=BH^2/BA:CH^2/AC
=BH^2/BA*CA/CH^2
=(BA/CA)^4*CA/BA=(BA/CA)^3
e: AN*NB+AM*MC
=NH^2+HM^2
=NM^2=AH^2
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