Divide 99 into four numbers, so that the first number plus 2, the second number minus 2, the third number multiplied by 2, the fourth number divided by 2, the results are equal. How do you think we should divide 99 into four numbers?

Let the equal number be x, then the remainder is (X-2), (x + 2), X2, 2x. From the meaning of the question, we can get: (X-2) + (x + 2) + x2 + 2x = 99, and the solution is: x = 22, then X-2 = 20, x + 2 = 24, X2 = 11, 2x = 44, so we should divide 99 into four numbers: 20, 24, 11, 44

Solving linear equation with one variable -- removing denominator and bracket
(x+1)/10-(x-1)/5=1

(x + 1) / 10 - (x-1) / 5 = 1, remove the denominator and multiply both sides by 10
(x + 1) - 2 (x-1) = 10
X + 1-2x + 2 = 10
2x-x = 1 + 2-10 merge congeners
x=-7

(people's Education Press) Grade 8 Volume 1 mathematics book p27 question 9

Angle BCE = angle CAD, angle e = angle CDA, BC = ca. so triangle BCE is equal to triangle CAD, so EC = Da = 2.5cm, be = CD = ec-ed = 0.8cm

17 / 19 [(4 / 9 + 1 / 2) * 9 / 17] simple calculation

17/19[(4/9+1/2)*9/17]
=17/19×9/17×（8/18+9/18）
=9/19×17/18
=17/38

Factorization: A & # 179; - 10A & # 178; + 25A

a³－10a²＋25a
=a(a^2-10a+25)
=a(a-5)^2

How much is one seventh times one eighth

Original formula = (64 + 8 / 7) × 1 / 8
=64×1/8+8/7×1/8
=8+1/7
=8 and 1 / 7

It is known that the circle C: x ^ 2 + y ^ 2-2x + 2Y + 1 = 0, the intersection of the line L tangent to the circle C, the positive directions of the x-axis and y-axis are at two points a and B, O is the origin, OA = a, OB = B (a > 2, b > 2). (1) prove that the condition for the circle C to be tangent to the line L is (A-2) (b-2) = 2; (2) find the trajectory equation of the midpoint of the line AB; (3) find the minimum area of △ AOB

It is known that the circle C: x ^ 2 + y ^ 2-2x + 2Y + 1 = 0, the intersection of the line L tangent to the circle C, the positive directions of the x-axis and y-axis are at two points a and B, O is the origin, OA = a, OB = B (A2, B2). (1) prove that the condition for the circle C to be tangent to the line L is (A-2) (b-2) = 2; (2) find the trajectory equation of the midpoint of the line AB; (3) find the minimum area of △ AOB

480 x-600 2x = 45

480 x-600 2x = 45
480 x-300 x = 45
-X of 800 = 45
x=-36000

Let m ∈ R, a > b > 1, f (x) = MX / (x-1), compare the size of F (a) and f (b), find the detailed explanation, thank you~

f(x)
=mx/(x-1)
=m+m/(x-1)
Obviously, when m > 0, f (x) is a decreasing function on x > 1, then f (a) f (b)
When m = 0, f (x) is equal to 0, then f (a) = f (b)

Find the rules: half, one-third, three-thirds, two fifths. What should I fill in the last two?
What is the specific law?

Three fifths, four fifths

Divide 99 into four numbers, so that the first number plus 2, the second number minus 2, the third number multiplied by 2, the fourth number divided by 2, the results are equal. How do you think we should divide 99 into four numbers?