1. Раскройте скобки - 3 + (a + b + c + d);
- 7 + (- a – b – c – d);
-12 • (-2a + 5b – 4c + 3d);
(-3a – 2b + 5c + 4d) • (-15)
2.Реши уравнения 4*(x-3)=8
2x-3=x+5
3x+16=2x-3
5*(x+3)=10 сделайте проверку для каждого уравнения
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