16:
a: 2^225=8^75
3^450=9^75
=>2^225<3^450
b: 2^12=4^6
4^18=64^6
14:
a: =>2x=4/3+5/4=31/12
=>x=31/24
b: =>x+1/5=-1/2
=>x=-7/10
c: =>x*(-2/3)=3/2-8/5=-1/10
=>x=3/20
d: =>2x=13,7
=>x=137/10:2=137/20
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