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-2t×(-st)=2st²
-5b ×¹/₃ ab=-⁵/₃ab²
pr×2pr= 2p²r²
-x ×-x²= x³
½ab×-⅙a²=-¹/₁₂ ba³
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×- razy
B) -2t*(-st)=2st²
C) -5b *¹/₃ ab=-⁵/₃ab²
D) pr*2pr= 2p²r²
E) -x *-x²= x³
F) ½ab*-⅙a²=-¹/₁₂ ba³