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2013-05-19T15:50:56+02:00

3/10 a= 7/10 +4/5

3/10 a = 3/2

a = 3/2 x 10/3

a = 5

 

3/4 a=5/6 +2/3

a= 3/2 x 4/3

a=2

 

2/3 a -1/2 a = 2/3 - 2/5

1/6 a = 4/15

a = 4/15 x6

a = 8/5