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=4/30*21/4 [ skróć 4 i 4 przez 4 skróć 30 i 21 przez 3] -1/10=
=7/10-1/10=6/10
= ( 2 i 5/6 - 2 i 7/10) * 21/4 - 1/10=
= ( 2 i 25/30 - 2 i 21/30) * 21/4 - 1/10=
= 4/30 * 21/4 - 1/10= (skracam ułamki)
= 1/10 - 7/1 - 1/10=
= 7/10 - 1/10 =
= 6/10 =
= 0,6