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Răspuns :

a+2/4=6/4
a=6/4-2/4=4/4

a-8/5=8/5
a=8/5+8/5
a=16/5

9/10-a=4/10
a=9/10-4/10
a=5/10
a+2/4=6/4
a=6/4-2/4=(6-2)/4=4/4=1

a-8/5=8/5
a=8/5+8/5=(8+8)/5=16/5

9/10-a=4/10
a=9/10-4/10=(9-4)/10=5/10=1/2

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