Special Haidian unit test AB grade 6 math page 35-36 answers There are 800 pear trees in the orchard, one third less than apple trees. How many of these two kinds of trees are there?

It's too easy
A total of 2000 trees
Two thirds of apples are pear trees
Pear tree divided by two thirds
It's apple
Add it up

A and B set out from a and B at the same time and walk towards each other. A walks 5km per hour and B walks 3km per hour. If they meet at 2km from the midpoint of a and B, the distance between a and B is () km

Meet at 2km from the midpoint of a and B
So a walked 2 km more than B, so the total time taken was 2 * 2 / (5-3) = 2 hours
So the distance between a and B = (5 + 3) * 2 = 16km

(1) Four children are playing on the seesaw. Their weights are p, Q, R and s, as shown in the figure. What is the relationship between their weights
(Figure: s > P, P > R, pr > QS)
(2) If the solution set of x-aa is 1

（1）s>p>r>q
(2)a=2 b= 1/2
(3)m

If we know that the area of the triangle formed by the image of the first-order function y = - 2x + B and the two coordinate axes is 9, then B =?

Let x = 0, then y = B;
Let y = 0, then x = B / 2
According to the meaning of the question, the equation is as follows
(1/2)×│b│×│b/2│＝9
The solution is: B = ± 6

It is known that the x-axis of the image of the quadratic function intersects a and B, and the equation of the symmetry axis is x = 2. If AB = 6 and the maximum value of the quadratic function is 5, then the analytic solution of the quadratic function is

The intersection of function and x-axis is at point (5,0) (- 1,0)
So let y = a (X-5) (x + 1)
Because the ordinate of the highest point is 5
Then y = 5, so a = - 5 / 9
y=-5/9(x-5)(x+1)
y=-5/9x^2+20/9x+25/9

Idiom: () over plucking

This idiom refers to those selfish people who never miss any chance to intercept what they handle

How much cement, stone and sand does self mixing concrete need?
For road construction, concrete strength is C30 and C25 respectively. 325 for cement, 5-16 for stone and medium sand for sand. No, please go away. Don't waste your feelings
What grade of concrete are you talking about?

C25: Cement 340, sand 800, stone 1020
C30: Cement 380 sand 720 stone 1100
The water consumption is generally adjusted from 190 to 210

Let a, B, C be real numbers, f (x) = (x + a) (x2 + BX + C), G (x) = (AX + 1) (CX2 + BX + 1). Let s = {x | f (x) = 0, X ∈ r}, t = {x | g (x) = 0, X ∈ r}. If {s}, {t} are the number of elements of S, T & nbsp; respectively, then the following conclusion is impossible ()
A. {s} = 1 and {t} = 0b. {s} = 1 and {t} = 1C. {s} = 2 and {t} = 2D. {s} = 2 and {t} = 3

∵ f (x) = (x + a) (x2 + BX + C), when f (x) = 0, there is at least one root x = - A, when b2-4c = 0, f (x) = 0 has another root x = - B2, as long as B ≠ 2a, f (x) = 0 has two roots; when B = 2A, f (x) = 0 is one root; when b2-4c < 0, f (x) = 0 has only one root; when b2-4c > 0, f (x) = 0 has two or three roots. When a = b = C = 0, {s} = 1, {t} = 0, when a > 0, B = 0 When C > 0, {s} = 1 and {t} = 1, when a = C = 1 and B = - 2, {s} = 2 and {t} = 2

There are 15000 books in a primary school library, including story books, science and technology books and comic books. Comic books account for 25% of the total and story books account for 30%
Science and technology books account for 45%. How many science and technology books are less than story books? What percentage of story books are comic books?

1. Number of story books: 15000 × 30% = 450 (copies)
Number of science and technology books: 15000 × 45% = 675
675-450 = 225
2. Number of comic strips: 15000 × 25% = 375 (copies)
375÷450×100%≈83.3%

The significance of the absolute value of a + 5 on the number axis

︱ a + 5 = ︱ a - (- 5) ︱ represents the distance from point a to point - 5 on the number axis

Special Haidian unit test AB grade 6 math page 35-36 answers There are 800 pear trees in the orchard, one third less than apple trees. How many of these two kinds of trees are there?