We go to the cinema on Sunday, and we go swimming on Sunday

We go to the cinema on Sunday, and we go swimming on Sunday

On Sunday we went to the cinema as well as swimming

I want to be idle at home and read books in the library
Another is that Qiu Shaoyun sacrifices himself and moves an inch

I think (anyway) at home idle, (as) library reading, Qiu Shaoyun (even if) sacrifice himself, (also don't) move an inch

My extracurricular life is very rich. I go to the museum every weekend. I go to the library to read books

Since Again
Or Or
Or Or

If the upper and lower bottom of a trapezoid is reduced by 6, the upper bottom of a parallelogram is reduced by 3, and a triangle is formed. At this time, the area of the original trapezoid is reduced by 6 cm
If the top and bottom of a trapezoid are reduced by 6cm, it becomes a parallelogram; if the top and bottom are reduced by 3cm, it becomes a triangle. At this time, the area of the trapezoid is reduced by 6cm, the original trapezoid area is/

The bottom is reduced by 6cm to form a parallelogram,
It means that the bottom is 6 cm longer than the top,
The length of the top and bottom is reduced by 3cm to form a triangle, which means that the length of the top and bottom is 3cm,
At this time, the area is reduced by 6 square centimeters. The reduced area is the area of a triangle with the upper bottom of the trapezoid as the bottom and the height of the trapezoid as the height. Therefore, the height of the original trapezoid is: 6 * 2 / 3 = 4cm,
Therefore, the original trapezoid area is: (3 + 3 + 6) * 4 / 2 = 24 square centimeters

Equation x ^ (lgx + 1) - 100 = 0

The original equation can be changed to 10 ^ ((lgx + 1) lgx) = 10 & # 178; so there is (lgx + 1) lgx = 2, there is LG & # 178; X + lgx - 2 = 0. This can be regarded as a quadratic equation of one variable with respect to lgx. The solution of the equation is lgx = - 2 or lgx = 1, so x = 10 ^ (- 2) = 0.01 or x = 10 ^ 1 = 10

Benben takes a long bamboo pole into a 3-meter-wide gate. He can't take it horizontally, but he can't take it vertically. As a result, he still can't take it, because the bamboo pole is just 1 meter higher than the gate. When he tilts the pole, its two ends are just opposite to the gate. Can you calculate the length of the bamboo pole?

Suppose the length of the pole is x m, and the height of the gate is (x-1) m, and there is 32 + (x-1) 2 = x2. Solving this equation, we get x = 5, that is, the length of the pole is 5 m

If f (x) = AX2 + BX + C (2a-3 ≤ x ≤ 1) is even, then a ∈______ ，b∈______ ，c∈______ ．

Because f (x) is an even function, f (- x) = x2-bx + C = AX2 + BX + C = f (x), so B = 0, C is any value. So the answer is: {1}; {0}; R

A trapezoidal wheat field, its area is 720 square meters, the upper bottom is 23 meters, the lower bottom is 25 meters, how high is it?

Let's start with the area formula of trapezoid
S ladder = (upper bottom + lower bottom) × height △ 2
Formula deformation
Height = area × 2 ^ (upper bottom + lower bottom)
have to
720 × 2 ÷ (23 + 25) = 30 unit: M
A
Master, mathematics is very interesting. We should learn mathematics well. Don't memorize those formulas and concepts by rote. We should understand them according to examples. Only in this way can we remember them well
study hard

Log (8) a + log (4) B ^ 2 = 5, log (8) B + log (4) a ^ 2 = 7, find the value of log (2) ab

Because log (8) a + log (4) B ^ 2 = 5
So 1 / 3log (2) a + log (2) B = 5
Because log (8) B + log (4) a ^ 2 = 7
So 1 / 3log (2) B + log (2) a = 7, ②
By taking log (2) a and log (2) B as a whole, log (2) a and log (2) B can be solved
I won't write the specific calculation

After the formula of equation x2-3x + P = 0, we get (x + m) 2 = 12. (1) find the value of constant P and m; (2) find the root of the equation

(1) ∵ x2-3x + P = 0, ∵ x2-3x = - P, x2-3x + (32) 2 = - P + (32) 2, (x-32) 2 = - P + 94, ∵ M = - 32, - P + 94 = 12, the solution is: P = 74, M = - 32; (2) ∵ x2-3x + P = 0, ∵ x-32) 2 = 12, x-32 = ± 22, that is, the solution of the equation is: X1 = 3 + 22, X2 = 3 − 22