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If the even function f (x) defined on R monotonically decreases on (- ∞, 0], and f (- 1) = 0, then the solution set of inequality f (x) > 0 is () A. （-∞，-1）∪（1，+∞）B. （-∞，-1）∪（0，1）C. （-1，0）∪（0，1）D. （-1，0）∪（1，+∞）
① When x ≤ 0, f (x) > 0, i.e. f (x) > F (- 1) ∵ f (x) monotonically decreases on (- ∞, 0]; - x ＜ - 1. When x > 0, f (x) > 0, i.e. f (- x) > F (- 1) ∵ f (x) monotonically decreases on (- ∞, 0]; - x ＜ - 1, because even function f (x) satisfies f (- x) = f (x), we can get that
If the even function f (x) defined on R monotonically decreases on (- ∞, 0], and f (- 1) = 0, then the solution set of inequality f (x) > 0 is ()
A. （-∞，-1）∪（1，+∞）B. （-∞，-1）∪（0，1）C. （-1，0）∪（0，1）D. （-1，0）∪（1，+∞）
① When x ≤ 0, f (x) > 0, i.e. f (x) > F (- 1) ∵ f (x) monotonically decreases on (- ∞, 0]; - x ＜ - 1. When x > 0, f (x) > 0, i.e. f (- x) > F (- 1) ∵ f (x) monotonically decreases on (- ∞, 0]; - x ＜ - 1, because even function f (x) satisfies f (- x) = f (x), we can get that
In the mathematical measurement of the height of the flagpole, ask, a student's height is 1.6 meters, shadow length is 2 meters, measured the shadow length of the flagpole is 15 meters, calculate the height of the flagpole?
My answer is
1.6 divided by 2 times 15 is 12 meters
How many points can I get if I score 10?
Can you tell me which theorem I used?
6 / 2 = 15 / x, X is the shadow length, the solution is x = 18.75m
Question the part in brackets
This lady is (my mother’s good friend).
This lady is (Miss Young).
who is this lady
what is name of this lady
(4 / x minus 7) - (3 / 5x plus 8) = 1
Remove the brackets to get X / 4-7-5x / 3-8 = 1
That is, X / 4-5x / 3 = 16
If you remove the denominator, you get 3x-20x = 192
-17x=192
x=-192/17
On a 1:2000 scale map, 6 cm line segments represent actual distances______ Rice
6 △ 12000 = 12000 (CM), 12000 cm = 120 m; answer: a line of 6 cm long means that the actual distance is 120 M
It's very simple to fill in the blanks
If & # 179; √ 3-x is meaningful, then the value range of X is____ ；
If the meaning of √ 3-x + x-3, then the value range of X is____ ；
If √ X & # 178; = 81, then the value of X is____ .
|What is the value of 2 - √ 5 | + | 3 - √ 5 |____ .
If √ X-1 is meaningful, then x can get the smallest integer____ .
If & # 179; √ 3-x is meaningful, then the value range of X is_ All real numbers___ ；
If the meaning of √ 3-x + x-3, then the value range of X is__ x=3__ ；
If √ X & # 178; = 81, then the value of X is__ ±81__ .
|What is the value of 2 - √ 5 | + | 3 - √ 5 |__ 1__ .
If √ X-1 is meaningful, then x can get the smallest integer__ 1__ .
How to calculate the gram weight of fabric
The gram weight of fabric generally refers to the gram weight of square meter,
The most commonly used gram weight tester is 10 square centimeters,
When you weigh it with a balance, multiply the number of grams you get by 1000 to get the weight of grams
And then you cut a 2 meter cloth, weigh it, divide it by 2, and then divide it by the door width
Find the area of the shadow in the graph. (unit: cm)
A parallelogram can be obtained by rotating along the axis of symmetry
Area = 8 × 5 = 40 square centimeter
What are the axisymmetric figures in life
The more you cite, the better
In general, as long as it is a cylinder, cone, ball, cube, cuboid, geometry are axisymmetric graphics, so there are cups (no handle), books, volleyball, football, basketball, badminton racket, lamp, cabinet, fan, stool, table, bed, quilt, sofa, couplet, pencil box, etc
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