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It is known that the solution set of inequality 2x < KX + B < 0 is () A. x＜-2B. -2＜x＜-1C. -2＜x＜0D. -1＜x＜0
As shown in the figure, when - 2 ＜ x ＜ - 1, 2x ＜ KX + B ＜ 0 holds
According to the proverbs, write idioms: people pick up firewood, the flame is high (), lift a stone to hit their own feet (), well water does not violate the river ()
When people gather firewood, the flame is high
Take a stone and hit yourself in the foot
Well water does not offend river water
The original price of a commodity is 100 yuan. How much is the current price if the price is increased by 10% and then decreased by 10%. If the price is decreased by 10% and then increased by 10%, how much is the current price?
emergency
First increase the price by 100 * 10% + 100 = 110, then reduce the price by 110 * (100-10)% = 99
First reduce the price by 100 * (100-10)% = 90, then increase the price by 90 * (100 + 10)% = 99
1234567890(1234567891)2−1234567890×1234567892．
Let 1234567891 = a, then 1234567890 = a-11234567892 = a + 1, the original formula = a − 1A2 − (a − 1) (a + 1) = a − 1A2 − (A2 − 1), = A-1, = 1234567891-1, = 1234567890
Mathematical problems of chicken and rabbit in the same cage
Chicken and rabbit in the same cage, a total of 248 legs, rabbit 52 less than chicken, then chicken, rabbit how many?
Thank you!
Suppose there are x rabbits
4x+2(x+52)=248
6x =196
x=24
24+52=76
There are 76 chickens and 24 rabbits
① The meaning of 3 / 7 △ 2 is () 0.8:2 / 3 = 6: ()
1、3/14
2、5
How large is the Palace Museum? How many hectares?
The Palace Museum was built by Emperor Zhu Di of Ming Dynasty. It took 14 years (1407-1420 A.D.) to recruit skilled craftsmen and servants from the north and south of the river. The plan is rectangular, 961 meters long from north to south, 753 meters wide from east to west, covering an area of more than 720000 square meters. The palace covers an area of 86 hectares, namely 860000 square meters
Love lotus speaks the original
If the mountain is not high, there will be immortals; if the water is not deep, there will be dragons. Si is a humble house, but I am Dexin. The moss marks are green on the upper steps, and the grass is green on the curtain. There are great scholars chatting and laughing, and there are no baiding people coming and going. You can tune the zither and read the golden Sutra. There is no disordered ear of silk and bamboo, and there is no paperwork
Tao Yuanming of Jin Dynasty loves chrysanthemum alone; since Li and Tang Dynasties, the world loves peony; Yu loves lotus only because it comes out of mud and does not dye it; Zhuo Qinglian and does not demon it; Zhong Tong and Wai Zhi are straight and does not ramble; Xiang Yuanyi is clear and quiet; you can see it from afar but do not play with it. Yu is chrysanthemum, the hermit of flower; peony, the rich and noble of flower; Lian, the gentleman of flower, It is rare to hear of empress Tao; who should give the love of lotus to? The love of peony should be popular
Mark the points a (4,0), B (3,4), C (0,2) in the rectangular coordinate system, O is the coordinate origin, and calculate the area of the quadrilateral oabc
There are pictures, great Xia, some excellent paintings of clams!
Make be vertical OA and a point e
OE=3,AE=1
Quadrilateral becomes right trapezoid oebc and right triangle Abe
Trapezoid area = 1 / 2 (OC + be) * OE = 1 / 2 * (2 + 4) * 3 = 9
Triangle area = 1 / 2 AE * be = 1 / 2 * 1 * 4 = 2
Quadrilateral area = 9 + 2 = 11
Should be clear? I hope I can help you
Calculation: 17.48 × 37 + 174.8 × 1.9 + 8.74 × 88
The original formula = 17.48 × 37 + 17.48 × 19 + 17.48 × 44 = 17.48 × (37 + 19 + 44) = 17.48 × 100 = 1748
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