50^n+1 / 2^n-3 * 5^2n+1 = (25*2)^n+1 / 2^n-3 * 5^2n+1 = 25^n+1 * 2^n+1 / 2^n-3 * 5^2n+1 =
=(5^2)^n+1 * 2^n+1 / 2^n-3 * 5^2n+1= 5^2(n+1) * 2^n+1 / 2^n-3 * 5^2n+1 = 5^2n+1 * 2^n+1 / 2^n-3 * 5^2n+1 = 5^ 2n+2-(2n+1) * 2^n+1-(n-3) = 5^1 * 2^4=5*16=80
1) 20a³·(5a)² = 500a⁵;
2) -0,4x⁵·(2x³)⁴ = -0,4x⁵·16x¹² = -6,4x¹⁷
3) (-c³)²·12c⁶ = c⁶·12c⁶ = 12c¹²
4) (3x⁶y³)⁴·(-1/81 · xy²) = 81x²⁴y¹²·(-1/81 · xy²) = -x²⁵y¹⁴;
5) (-2/3 ·ab⁵)³·18a⁵b = -8/27 · a³b¹⁵ · 18a⁵b = -16/3 · a⁸b¹⁶
9ab - 12bc + 3abc=3b(3a-4c+ac)