Solving inequality: first question: X & # 178; - 2x-3 < 0 second question: X & # 178; - 26x + 169 > 0 third question: - 1 / 2x & # 178; - 6 ≤ - 4x

Solving inequality: first question: X & # 178; - 2x-3 < 0 second question: X & # 178; - 26x + 169 > 0 third question: - 1 / 2x & # 178; - 6 ≤ - 4x

X²-2X-3＜0
(x-3)(x+1)

0×1×2×3+1=1=1²；1×2×3×4+1=25=5²；2×3×4×5+1=121=11²；
3 × 4 × 5 × 6 + 1 = 261 = 19 and 178?
In letters

(n^2+3n+1)^2
n(n+1)(n+2)(n+3)+1=(n^2+3n+1)^2
n(n+1)(n+2)(n+3)+1
=[n(n+3)][(n+1)(n+2)]+1
=(n^2+3n)(n^2+3n+2)+1
=(n^2+3n)^2+2(n^2+3n)+1
=(n^2+3n+1)^2

(3x + 1) &# 178; - 4 = 0.5x & # 178; - 7x-6 = 0.25x & # 178; - 10-1 = 0,

（3x+1)²-4=0
(3x+1+2)(3x+1-2)=0
3x+3=0 3x-1=0
x1=-1 x2=1/3
5x²-7x-6=0
(5x+3)(x-2)=0
5x+3=0 x-2=0
x1=-3/ x2=2
25x²-10-1=0
(5x+3)(5x-3)=0
5x+3=0 5x-3=0
x1=-3/5 x2=3/5

The asymptotic equation of hyperbola 25X & # 178; - 16y & # 178; = - 400 is

25X ^ 2-16y ^ 2 = 400 = = = > x ^ 2 / 16-y ^ 2 / 25 = 1, so a ^ 2 = 16, B ^ 2 = 25; C ^ 2 = a ^ 2 + B ^ 2 = 41, then a = 4, B = 5, C = √ 41, real axis length = 2A = 8, imaginary axis length = 2B = 10, vertex coordinates (± 4,0), focus coordinates (± √ 41,0), asymptote equation y = ± (5 / 4) x, eccentricity e = C / a = √ 41 / 4! I'm very happy to

How to get x when 12 △ 0.25x = 3

Fractional equation
12/（x/4）=3
48/x=3
x=16

66 = x + 0.25x find x

9.66=X+0.25X
1.25x=9.66
The solution is x = 7.728
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How to solve 16 / 0.25x = 20 ÷ [1 / 3 (13-x)]

16/0.25x=20÷[1/3(13-x)]
64/x=60/(13-x);
16/x=15/(13-x);
15x=16×13-16x;
31x=16×13;
x=208/31;
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How to solve x 0.25x = 0.625

Is it x + 0.25x = 0.625?
(1+0.25)x=0.625
1.25x=0.625
x=0.625÷1.25
x=0.5

How to solve 0.5 (x-1) = 0.25x?

0.5(x-1)=0.25x
0.5x-0.5=0.25x
0.5x-0.25x=0.5
0.25x=0.5
x=0.5/0.25=2

How do you solve 1.25x = x + 1.5

First, move the right x to the left, and then merge it with the left 1.25x, that is, 0.25x = 1.5. Then divide 0.25 to get x = 6,