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а) = а1/5×а3/10=а1/2=√а

б)=с2/5(2/3с²) ×9/10:с3/5=9/10×1/с×3/5=с2/5×2/3с²×9/10×1/5=с2/5×2с²×9/10×1/с×1/5=с2/5×2с×9/10×1/5=с2/5с×9/5×1/5=9/25с2/5с=9/25х 5√с²с=9с5√с²/25