Зарание большое спасибо

упростить выражение и подчеркнуть коэффициент

а) -4b ∙ ( -2а )

б)-1/5 m^2 ∙ ( -45mb )

в) a ∙ ( -5/6 k ) ∙0,6

г) 6/13 x ∙ ( -0,13y )

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