х²• х³• х⁸ = x¹³ (13 = 2+3+8)
х¹⁵: х¹⁰: х³ = x² (2 = 15-10-3)
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х²• х³• х⁸ = x¹³ (13 = 2+3+8)
х¹⁵: х¹⁰: х³ = x² (2 = 15-10-3)