A3=A1+d(3-1)=A1+2d
A3=1-2*2= -3
Ответ: -3
(4/5)^[(x²-3x)/(x-6)]=(4/5)^-2
(x²-3x)/(x-6)=-2
x≠6
x²-3x=-2(x-6)
x²-3x+2x-12=0
x²-x-12=0
x1=x2=1 u x1*x2=-12
x1=-3 U x2=4
а) 6²-(7(n+2))²=(6-7(n+2))(6+7(n+2))= (-8-7n)(20+7n)= -(8+7n)(20+7n)
б) ((x+5)-3(x-1))((x+5)+3(x-1)) = (8-2x)(4x+2)
в) (2(3а²+2b)-(3a²-2b))(2(3a²+2b)+(3a²-2b)) = (3a²+6b)(9a²+2b)
Корень1/7*7/11*11/16=корень1/16=1/4.
корень13целых4/9=корень121/9=11/3=3целых2/3
<span>y+3 3/14= -1 4/21
у = </span>-1 4/21 - 3 3/14
у= - 4 17/42
-4 17/42 + 3 3/14 = - 14/21
-4 17/42 + 3 3/14 = - 25/21-45/14=-50/42-135/42=-185/42=-14/21