Упростите выражение
упр 279.
1) 6 (2t – 3n) - 3 (3t — 2n);
3) -2 (3x-2y) -5 (2y – 3х):
2) 5 (a-b) - 4 (2а – 3b);
4) 7 (4р+3) – 6 (5 +7р).​
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