ПОМОГИТЕ СРОЧНО, ИНАЧЕ 2 ПОСТАВЯТ ЗАВТРА..

а) -9у*(-2xy²)

              3

б) -0,4х²у*5у³х³ 

 

3.Упростите выражения: 

а)(-0,3ab⁴)³

 

б) (-a⁷b³)²*4ab⁹

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