1)5х+3(х-1)=6х+1
5х+3х-3=6х+1
8х-3=6х+1
8х-6х=1+3
2х=4
х=4:2
х=2
2)3х-5(2-х)=54
3х-10+5х=54
8х-10=54
8х=54+10
8х=64
х=64:8
х=8
3)8(у-7)-3(2у+9)=15
8у-56-5у-27=15
3у-83=15
3у=15+83
3у=98
у=98:3
у=32,66
у=32,7
1) 1 - 5x² = 1 - 5 * (- 4)² = 1 - 5 * 16 = - 79
2) y⁷ * y¹² = y⁷⁺¹² = y¹⁹
y²⁰ : y⁵ = y²⁰⁻⁵ = y¹⁵
(y²)⁸ = y¹⁶
( 2y)⁴ = 16y⁴
a) - 2ab³ * 3a² * b⁴ = - 6a¹⁺²b³⁺⁴ = - 6a³b⁷
б) (-2a⁵b²)³ = - 8a¹⁵b⁶
5)
![\frac{25^{2}*5^{5}}{5^{7} } =\frac{(5^{2})^{2}*5^{5}}{5^{7} } =\frac{5^{4}* 5^{5} }{5^{7} }=5^{4+5-7} =5^{2} =25](https://tex.z-dn.net/?f=%5Cfrac%7B25%5E%7B2%7D%2A5%5E%7B5%7D%7D%7B5%5E%7B7%7D%20%7D%20%3D%5Cfrac%7B%285%5E%7B2%7D%29%5E%7B2%7D%2A5%5E%7B5%7D%7D%7B5%5E%7B7%7D%20%7D%20%3D%5Cfrac%7B5%5E%7B4%7D%2A%205%5E%7B5%7D%20%7D%7B5%5E%7B7%7D%20%7D%3D5%5E%7B4%2B5-7%7D%20%3D5%5E%7B2%7D%20%3D25)
3х^2-27x=0
x(3x-27)=0
3x(1-9)=0
24x=0
x=0