1/5c+7/20c−1/4c=
=4/20с+7/20с-5/20с=
=11/20с-5/20с=
=6/20с=6/20×1/6=1/20
Надеюсь помогла
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1/5c+7/20c−1/4c=
=4/20с+7/20с-5/20с=
=11/20с-5/20с=
=6/20с=6/20×1/6=1/20
Надеюсь помогла