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3

((1/2)^2 + (1/4)^2)/(1/2 + 1/4)^2=

=(1/4 + 1/16)/(3/4)^2=

=5/16/(9/16)= 5/9

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(1/2 + 1/3)/(1/2/1/3)/((1/2)^2 - (1/3)^2)=

=5/6/(1/2/1/3)/((1/4) - (1/9))=

=5/6/(1/2/1/3)/(5/36)=

=5/(5/36)= 36



3

125)

(12)2+(14)2(12)2+(14)2=

=14+116(2+14)2=

=4+116(34)2=

=516916=

=5161·1619=59



3
image

1/4+1/16 = 5/16 

(1/2+1/4)^2 = (3/4)^2 = 9/16

5/16*16/9 = 5/9



2
image

1/2+1/3 = 5/6

1/2-1/3 = 1/6

5/6*6 = 5

(1/4-1/9) = (9-4)/36 = 5/36

3*36/5 = 36  



1

126)

12+131213(12)2(13)2=

=3+263261419=

=56169436=

=56·61536=

=561·611536=

=5·365=51·3651=36

 



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