Rozwiąż
9- x^2 -x^2 -1/9 = 2/9 /*9
81-18x^2 -1 =2
-18x^2= 2-81+1
-18x^2=-78 /( -18)
x^2= 13/3
x= pierwiastek z 4 1/3
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9- x^2 -x^2 -1/9 = 2/9 /*9
81-18x^2 -1 =2
-18x^2= 2-81+1
-18x^2=-78 /( -18)
x^2= 13/3
x= pierwiastek z 4 1/3