1.15. Упростите выражение: 1) a² + a²; 2) x² + x² + x²; 3) m³ + m³ + m³; 4) bb + bb+bb; 7) 5) xxx + xxx; 6) aa+aa + bbb + bbb; xx + xx + xx yyy+yyy



помогите пожалуйста
очень надо ​
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