Автор - Dkotsyuba

1) (с-5d)-(-d+5c)=
2) -(5n+m)+(-4n+8m)-(2m-5n)=

Ответ

Автор - wasilechek
1) (с-5d)-(-d+5c)=c-5d+d-5c=-4d-4c= -4(d+c)

2) -(5n+m)+(-4n+8m)-(2m-5n)=-5n-m-4n+8m-2m+5n=5m-4n

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