4(8x-5) -3(4x+3) + 6(2-9x) = -3 * 12
32x-20 - 12x -9 + 12 - 54x = - 36
32x-12x- 54x = -36 +20 +9 -12
-34x = - 19
x= -19 \ (- 34)
x= 19\34
A₁₁ = a₁ + 10d
10d = a₁₁ - a₁ = 46 - 6 = 40
d = 40 : 10 = 4
a₁₂ = a₁ + 11d = 6 + 11 * 4 = 6 + 44 = 50
D= -5
a1=9,2
а11 -?
а11= а1 +d*(n-1)
a11 = 9,2 -5 (11-1) =9,2 -5*10= 9,2 -50 = - 40,8
2^12*3^5/3^3*4^3*6^3=2^12*3^2/2^6*2^3*3^3=
2^12/2^9*3=2^3/3=8/3