1.Упростите выражение: a) 4(-3a-4b) б) - 5(-2c+7d); в) 3(-5a+3b); г) -6(4a+2b)
2. Раскройте скобки: а) (-a-b)+(-c+d); б) -(-a-b)-(-c+d); в) - (a+b)+(-c-d);
г) -(a+b)-(c-d).
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