How to solve the problem of X + 8 / 3 = 8 / 7 with equation?

How to solve the problem of X + 8 / 3 = 8 / 7 with equation?

x+8/3=8/7
x=8/7-8/3
x=24/21-56/21
x=-32/21

How to solve the problem of 2 (x-1) (x + 5) - 3 (X-2) - 4x = 2x square + 7 equation?

2x²+8x-10-3x+6-4x=2x²+7
x-4=7
x=11

In the arithmetic sequence, how to calculate the tolerance, the last term and the number of terms

(Prime Minister + last item) * number of items / 2
Tolerance d = an-a (n-1)
The last term an = a1 + (n-1) * D
The number of items depends on how many items an is

8.6 times of a number is 60 times more than 3.6 times
Add 100 points

Let this number be X
8.6x-3.6x=60
5x=60
x=12

My habit of 50 words

My name is Yaya.I am in Grade Seven this year.I usually get up at six .At about seven I go to school by bike.I have four classes in the morning .I have three classes in the afternoon.I like English.I ...

In the plane rectangular coordinate system, a (- 1,1), B (2, - 1) C (1,4) three points form a triangle, then what triangle is this triangle

|AB|²=(2+1)²+(-1-1)²=13
|AC|²=(1+1)²+(4-1)²=13
|BC|²=(1-2)²+(4+1)²=26
So | BC | & # 178; = | ab | & # 178; + | AC | & # 178;,
Triangle ABC is an isosceles right triangle

A cuboid. The surface area is 184 square centimeters, the bottom area is 20 square centimeters, and the perimeter of the bottom surface is 18 centimeters

Surface area = 184 square centimeters
Bottom area = 20 square centimeters
Side area = 184-20 * 2 = 144 square cm
H = 144 / 18 = 8 cm
Volume = height * bottom area = 8 * 20 = 160 CC

Given sin = 3 / 5, a ∈ (0, π / 2), find the value of Tana, find the value of cosa / 2
Kneeling mathematics teacher, online, etc

For the purpose of solving Sina = 3 / 5 \ (0, π / 2) and (0, π / 2) \\178; a + cos \\\\\\\\\\; a = 1 \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\it's not easy

It is known that the equation K ^ 2 * x ^ 2 + (2k-1) x + 1 = 0 about X has two unequal real number roots x1, x2. First, find the value range of K; second, whether there is a real number k, so that the two real number roots of the equation are opposite to each other? If there is, find the value of K; if not, explain the reason

First question:
From the theme
△=b^2-4ac>0
(2k-1)^2-4k^2>0
4k^2-4K+1-4k^2>0
1-4k>0
k

Let f (x) be an odd function over the domain R, and f (x) = x ^ 2 when x > 0. For any x [- 3,3], the inequality f (x + T) 2F (x), then the value range of real number T?
Explain the result of "satisfy 2F (x) = f (√ 2x)" in this step

When x ≥ 0, f (x) = x & sup2;
∵ functions are odd
When x