308. Упростите выражение:
1) (5a4 + 3a2b – b³ ) - (3a⁴ - 4а2b – b2 );
2) (12xy - 10х2 + 9y2 )-(-14х2 +9ху - 14y2 )
3) (7ab2 - 8ab + 4a2b) + (10ab - 7а2b);
4) (2c2 + 3с) + (-c2 +с) - (C2 + 4c - 1),
1) (5a4 + 3a2b – b³ ) - (3a⁴ - 4а2b – b2 );
2) (12xy - 10х2 + 9y2 )-(-14х2 +9ху - 14y2 )
3) (7ab2 - 8ab + 4a2b) + (10ab - 7а2b);
4) (2c2 + 3с) + (-c2 +с) - (C2 + 4c - 1),
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