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2014-01-22T22:11:19+02:00
2x/9+0.5=0.75 =>
=> 2x/9=0.25
2x=2.25
x=1.125 adica 9 supra 8

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2014-01-22T22:14:36+02:00
2/9 x+5/10=75/100
2/9 x+1/2=3/4
numitor comun este 36
8/36 x+18/36=27/36
(8x+18)/36=27/36
8x+18=27
8x=9
x=9/8
2 5 2