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= v(7/2 * 7/8) - 3* (3)v(1/50 * 25/4)=
= v( 49/16) - 3* (3)v(1/8)=
= 7/4 - 3* 1/2 =
=7/4 - 3/2 =
=7/4 - 6/4 =
= 1/4
v- pierwiastek
(3) - 3 stopień pierwiastka