1. Упростите выражение: a) -За +7а -10а б) 3x-5-2x+ 7. 2. Раскройте скобки и упростите: a) n +(-8m+ 2n) б) -4y-3(-5x +2y) в) -(a -6b)+(-8x+ y) г) 4(а -9) -2(13-За) (11-а)
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