1. 6ab⁵ = -7
1) 3*6ab⁵ = 18ab⁵ = 3*(-7) = -21
2) (6ab⁵)² = 36a²b¹⁰ = (-7)² = 49; 36a²b¹⁰:6 = 6a²b¹⁰ = 49÷6 = ![\displaystyle \frac{48+1}6 =\bold{8\frac16 }](https://tex.z-dn.net/?f=%5Cdisplaystyle%20%5Cfrac%7B48%2B1%7D6%20%3D%5Cbold%7B8%5Cfrac16%20%7D%20)
2.
![\displaystyle 128x^2y^3\cdot (\frac{-1}4 xy^3)^3=128x^2y^3\cdot (\frac{-1}{4^3} x^3y^9)=\frac{-2\cdot 64}{64} x^{2+3} y^{3+9} =\bold{-2x^5y^{12}}](https://tex.z-dn.net/?f=%5Cdisplaystyle%20128x%5E2y%5E3%5Ccdot%20%28%5Cfrac%7B-1%7D4%20xy%5E3%29%5E3%3D128x%5E2y%5E3%5Ccdot%20%28%5Cfrac%7B-1%7D%7B4%5E3%7D%20x%5E3y%5E9%29%3D%5Cfrac%7B-2%5Ccdot%2064%7D%7B64%7D%20x%5E%7B2%2B3%7D%20y%5E%7B3%2B9%7D%20%3D%5Cbold%7B-2x%5E5y%5E%7B12%7D%7D%20)
1.
а) 5х^2(х^2 - 2х + 3) = 5х^4 - 10х^3 + 15х^2
б) - 8у^2(у^2 - 5у - 1) = - 8у^4 + 40 у^3 + 8у^2
2.
216bc/180ac = 4c( 54b/45a) = 54b/45a
-2*(X+6)-7=15
-2*(x+6)=15+7
-2*(x+6)=22 |:(-2)
x+6=-11
x=-11-6
x=-17
2 способ:
-2*(x+6)-7=15
-2*x+(-2)*6-7=15
-2x-12-7=15
-2x=15+19
-2x=34 |:(-2)
x=-17