0,42(6)=0,42666..
0,12(3)=0,123333...
0,42(6)+0,12(3)=0,54(9)
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0,12(3)=(123-12)/900=111/900
(384/900) - (111/900)=273/900=91/300=0,30(3)
Verified answer
0,42(6)=0,42666..
0,12(3)=0,123333...
0,42(6)+0,12(3)=0,54(9)