№12.15
1) (5a^2 - 4x + 25)+(-31 +9a^2 – 3x);
2) (17y + 8b^2 - 11) - (70 - 9b^2 + 18y);
3) (2,3c-9,1z^3 - 4) -(10z^8 - 3c +5,9);
4) (0,8t^2 – 20m + 5)-(41 – 3m - 2,4t^2).


Знак ^ —это степень
Пожалуйста расспишите)

ДАЮ 70 БАЛОВ!!!
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