Solution equation: 6 times (2x-7) = 5 times (x + 8) + 9 g

Solution equation: 6 times (2x-7) = 5 times (x + 8) + 9 g

6 times (2x-7) = 5 times (x + 8) + 9
That is 12x-42 = 5x + 40 + 9
Transfer 12x-5x = 40 + 9 + 42
That is 7x = 91
So x = 91 / 7 = 13

{7.5-2x} times 2.4 = 10.8 to solve the equation

(7.5-2x)*2.4=10.8
7.5-2x=10.8/2.4=4.5
7.5-4.5=2x
2x=3
x=1.5

12-2x = 7.6 and 3 (x - 9) = 18 solutions, don't forget to test

12-2x=7.6
12-7.6=2x
4.4=2x
2.2=x
x=2.2

Conversion between mu and M2
80 square meters = how many mu?

Because 10000 square meters = 1 hectare = 15 mu,
Then 1 square meter = 15 △ 10000 = 0.0015 mu,
Therefore, 80 square meters = 0.0015 × 80 = 0.12 mu

The front view is an equilateral triangle, the side view is a semicircle, and the top view is a pair of two triangles, similar to but with a vertical line in the middle

The top view is two semicircles, but there is a vertical one in the middle. It should be a cylinder with a diameter of 2 at the bottom and a height of √ 3. Cut the remaining part of two knives along the diameter above

In the plane rectangular coordinate system xoy, the line L and the parabola y ^ = 4x intersect at different points a and B
(1) If the line L passes through the focus of the parabola, find the value of the vector OA * ob
(2) If the vector OA * ob = - 4, it is proved that the line l must pass a certain point, and the fixed point can be obtained

1) The focus of the parabola is (1,0), y = K (x-1), and K ^ 2 (x-1) ^ 2 = 4x is brought in, and x ^ 2 - (2 + 4 / K ^ 2) + 1 = 0 is sorted out. According to the relationship between root and coefficient, x1 * x2 = 1; X1 + x2 = 2 + 4 / K ^ 2; Y1 * y2 = k ^ 2 (x1-1) (x2-1) = k ^ 2 (x1 * x2-x1-x2 + 1) = - 4, so OA * ob = - 3
2) Let the straight line L: y = KX + B, take into the parabolic equation (KX + b) ^ 2 = 4x, and sort out x ^ 2 - ((4-2kb) / K ^ 2) x + B ^ 2 / K ^ 2 = 0;
According to the relationship between root and coefficient, X1 * x2 = B ^ 2 / K ^ 2, X1 + x2 = (4-2kb) / K ^ 2; Y1 * y2 = (kx1 + b) (kx2 + b) = k ^ 2x1 * x2 + KB (x1 + x2) + B ^ 2 = B ^ 2 + (4-2kb) * KB / K ^ 2 + B ^ 2 = 4KB / K ^ 2; so x1x2 + y1y2 = (b ^ 2 + 4KB) / K ^ 2 = - 4; sorted (2k + b) 2 = 0; that is, 2K + B = 0; B = - 2K; so l: y = K (X-2), this straight line passes through (2,0)

How many cubic carbon dioxide can one kilogram of ammonium bicarbonate produce
Heating 1 kg ammonium bicarbonate can produce respectively how much carbon dioxide + ammonia + water, expressed in grams, accurate bonus!

2nh4hco3 + H2SO4 = 2co2 + 2H2O + (NH4) 2SO4 158 -------- 44.83.95 -------- YY = 1.12 L = 0.00112 m3

50 items of monomial calculation
One question is one

5x²+3x²+2x=8x²+2x
6xy+2x²y+3x²y=5x²y+6xy
2a²+4ab+3a²=5a²+4ab

Given that the vertex of the parabola is (- 1,2) and passes through (2,0), the analytic expression of the quadratic function is obtained

The vertex is (- 1,2)
So y = a [x - (- 1)] & sup2; + 2
=a(x+1)²+2
Over (2,0)
So 0 = a (2 + 1) & sup2; + 2 = 9A + 2
a=-2/9
So y = - 2 / 9 (x + 1) & sup2; + 2
That is y = - 2x & sup2 / 9-4X / 9 + 16 / 9

The difference and connection between light reaction and dark reaction
Difference, (condition, place, material change, energy change, essence,)
contact

Conditions: light reaction must have light to carry out dark reaction. There is no light requirement place: light reaction takes place on the thylakoid membrane of chloroplast, dark reaction takes place material change in chloroplast matrix: light reaction needs water to generate reduced hydrogen, oxygen is released, ADP generates ATP, dark reaction provides energy for reduced hydrogen and ATP, which is converted into ADP