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\(1,44a^2b^2-0,25c^2=\)

• \((1,2ab-0,5c)^2\)
• \((1,2ab-0,5c)(1,2ab+0,5c)\)
• \((1,2ab-0,5c)(1,2ab-0,5c)\)

\(0,09m^2-6mn+100n^2=\)

• \((0,3m-10n)(0,3m+10n)\)
• \((0,3m-10n)^2\)
• \((0,3m+10n)^2\)

\(\dfrac19 x^2-\dfrac{1}{25}=\)

• \((\cfrac13 x-\cfrac15)(\cfrac13 x-\cfrac15)\)
• \((\cfrac13 x-\cfrac15)^2\)
• \((\cfrac13 x-\cfrac15)(\cfrac13 x+\cfrac15)\)