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=4v7/7 - 1/9 = 36v7/63 - 7/63=
=(36v7-7)/63
chyba , ze miało być:
V(1 7/9) -3^0 * (-1/3)^2=
=V(16/9)-1*1/9=
=4/3 - 1/9=
=12/9 -1/9=
=11/9=
=1 2/9