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2. 15
3.
4. ÷ 10a²b² =
2) (5 x 3)x¹⁺²y¹⁺²z²⁺¹ = 15x³y³z³
3) b⁴ x 2b⁴ = 2b⁸
4) (5 x 12 : 10)a²⁻²b¹⁺³⁻² = 6b²