Ответ:
1) =-5m+4k-4m+7k-8m=-17m+11k
2)=4n-3-7+5n-8=9n-10
3) =a⁵-8a⁴-5a-a⁵+3a⁴+5a²+7=-5a⁴+7
4)=7y⁴+6y³-5y-y⁴+3y³-y²+12=6y⁴+9y³-y²-5y²+12
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Ответ:
1) =-5m+4k-4m+7k-8m=-17m+11k
2)=4n-3-7+5n-8=9n-10
3) =a⁵-8a⁴-5a-a⁵+3a⁴+5a²+7=-5a⁴+7
4)=7y⁴+6y³-5y-y⁴+3y³-y²+12=6y⁴+9y³-y²-5y²+12