1 in 5 + 7 in 10 is 9 in 10, right

1 in 5 + 7 in 10 is 9 in 10, right

yes

How much is x equal to 2x times x = 30

Make a vertical line from a vertex of a triangle to its opposite side. The line between the vertex and () is called () of the triangle, and this side is called () of the triangle
This opposite side is called the triangle

Make a vertical line from a vertex of a triangle to its opposite side. The line between the vertex and (opposite side) is called the (high) of the triangle, and this side is called the (bottom) of the triangle

The solution to the inequality (- 1-kx) / 6 〉 kx-6 (k is not equal to 0)

(-1-kx)/6〉kx-6
-1-kx >6kx -36
-7kx>-35
kx

In the triangle ABC, if we know that three times is a continuous positive integer and the maximum angle is an obtuse angle, what is the cosine of the maximum angle

1 + 2 = 3, so 123 is not 3 ^ 2 + 4 ^ 2 = 5 ^ 2, so 345 is not, so three sides are 234 big sides to big angles, so it should be the diagonal a of the side with length 4. According to the cosine theorem 4 ^ 2 = 2 ^ 2 + 3 ^ 2-2cosa * 2 * 3, cosa = - 0.25, that is, the cosine of the largest angle is -0.25

Given the quadratic function y = 2x & sup2; + 9x + 34, when the independent variable x takes two x1, X2, the value of the function is equal, then when the independent variable x takes X1 + X2, the value of the function is equal
The function values are equal when a · x = 1
The function values are equal when B · x = 0
The values of functions are equal when C · x = 1 / 4
The function values are equal when D · x = 9 / 4 of negative

The function values are equal when B · x = 0
When the independent variable x takes two x1, X2, the function values are equal, which means that the axis of symmetry is x = (x1 + x2) / 2
Then the function value of x 1 + x 2 is equal to that of 2 * (x 1 + x 2) / 2 - (x 1 + x 2) = 0
So, choose B

Finding partial derivative of function: u = sin (x ^ 2 + y ^ 2 + Z ^ 2)
$(acontent)

The partial derivative x = cos (x ^ 2 + y ^ 2 + Z ^) * 2x. Similarly, the partial derivative of Y, Z is just to replace the X outside cos () with the corresponding y, Z

Zhang Yang put his go pieces into a square, sharing 40 pieces, and there are several pieces on each side

There are 11 pieces on each side
The steps are as follows:
1. Each corner has one chess piece, four squares, and 36 left
2. 36 divided by 4 is the average of the remaining pieces divided into four, that is, there must be nine pieces on each side
3. Each variable has two right angles, so it has two pieces
4、2+9=11
thank you!

The value range of independent variable X of function y = √ (5x-1) + √ (7-2x) + 1 / (X-2) is

Greater than or equal to 0 under root sign
5x-1>=0
x>=1/5
7-2x>=0
x

In the inverse scale function y = K / x, k > 0, when k

When k