Срочно 50 баллов! Упростите выражение и подчеркните числовой коэффициент
а) -8а * (-7)=
б) с*(-47b)=
в)-xy * (-3) =
Г) - 4\5m* 5/28n =
д) 2/11а* 11\18b*9c =
Е) 4\9 x*(- 5\16y) * 9\5=
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