6,9-10+7,94y=1+6,9-2,06y
7,94y+2,06y=1+6,9-6,9+10
10y=11
у=1,1
Ответ:1,1
(a/b)^9 = a^9 / b^9
но b ≠ 0
A) -5a^n(3a^2-0,2b+ab)=-15a^(n+2)+a^n b+5a^(n+1)b
б)(a+4)(a-5)=a^2+4a-5a-20=a^2-a-20
в) (35 a^3 b - 28 a^4):7a^3=5b-4a= - 4a+5b
12+6х=0
6х=0-12
6х=-12
х=-12 :6
х=-2
0,3⁻³ + (3/7)⁻¹ + (-0,5)⁻² * 3/4 + (-1)⁻⁸ * 6 =
= 1/(0,3)³ +(7/3)¹ + 1/(-0,5)² * 3/4 + 1/(-1)⁸ * 6 =
= (10/3)³ + 7/3 + (-10/5)² * 3/4 + 1 * 6 =
= 1000/27 + 7/3 + 100/25 * 3/4 + 6 =
= 1000/27 + 63/27 + 3 + 6 =
= 1063/27 + 9 =
= 39 10/27 + 9 = 48 10/27