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3b * 6a = 18ab
b) -2t,-st
-2t * (-st) = 2st²
c) -5b, ⅓ab
-5b * ⅓ab = -⁵/₃ab² = -1⅔ ab²
d) pr, 2pr
pr * 2pr = 2p²r²
e) -x, -x²
-x * (-x²) = x³
f) ½ab, -⅕a²
½ab * (-⅕a²) = -¹/₁₀ a³b
b) 2st²
c) -[5/3]ab² (5/3 - ułamek)
d) 2p²r²
e) x³
f) -0,1a³b