Steaming: pay attention to pronunciation___ Pay attention to the font___ . Trade

Steaming: pay attention to pronunciation___ Pay attention to the font___ . Trade

Steamed: pronunciation should pay attention to the tongue and nasal; font should pay attention to the up and down structure

In the following words, the correct pronunciation group of glyph and punctuation is ()
A. Listen to things and choose to be dead
B. Restlessness, ups and downs, Yin (Y ī n) Hong Han Ying Zui (J ǔ) Hua
C. Harmony, not inferiority, not resistance
D. A combination of Chinese and Western culture

The correct answer is: D
A. natural selection (SH ù)
B fidgety Yin (y'n) red
C is neither humble nor overbearing, touching (Xian's second voice)
Each has two mistakes

Car a and car B leave the two cities at the same time and meet each other four hours later. The speed ratio of the two cars is 5:4. The distance between the two cities is 360km. What is the speed of the two cars?

Speed sum of vehicle a and vehicle B: 360 △ 4 = 90km
The speed of car a is: 90 △ 9x5 = 50km
The speed of car B is: 90 △ 9x4 = 40km
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In the equation 2x + 3Y = 10, when 3x-6 = 0, y=

∵3x-6=0
3x=6
∴x=2
And ∵ 2x + 3Y = 10
4+3y=10
3y=6
∴y=2

Two cars a and B leave 324km apart at the same time. After six hours, they meet on the way. The speed of car a is 4 / 5 of that of car B, and the speed of car a is 4 / 5 of that of car B
What's the speed of car a?

Hello!
The speed ratio is 4:5
Speed sum: 324 △ 6 = 54 km / h
The speed of a is 54 △ (4 + 5) × 4 = 24 km / h
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The decimal point of a number moves to the right by two digits, 118.8 greater than the original number. How much is the original number?

Let the original number be x, then 100x-x = 118.8
So x = 1.2
To move the decimal point to the right by two places is to increase the original number to 100 times, 118.8 times larger than the original number, that is to say, 99 times of the original number is 118.8, so the original number is 1.2
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A and B run from two places at the same time. A runs 83 kilometers per hour and B 95 kilometers per hour. The two cars meet at 24 kilometers away from the midpoint to find the distance between the two places

The distance between the two places is 4 × (83 + 95), = 4 × 178, = 712 km; a: the distance between the two places is 712 km

Let the sum of the two sides of the triangle be 10, the angle between them be θ, and the equation 10x ^ 2-10xcos θ + 3cos θ + 4 = 0 has two equal real roots, then the maximum square root of the triangle area can be obtained

△=（10cosθ）²-40（3cosθ+4）=0
That is 100 (COS θ) & sup2; - 120 cos θ - 160 = 0
5（cosθ）²-6cosθ-8=0
We get cos θ = - 4 / 5
So sin θ = 3 / 5
Let two sides of triangle be x, 10-x respectively
S△=(1/2)*x*(10-x)*(3/5)
=-(3/10)*(x-5)²+7.5
When x = 5, the maximum area of triangle is 7.5

How many hours does it take for a car to complete the whole journey?

Suppose it takes x hours for the car to complete the journey
X：1=8：2/5
X=20

Fraction m ^ 2-m ^ 2 / m ^ 2 + 3MN + 2n ^ 2
2. Given a + B = - 18, ab = 12, find the value of a ^ 2-ab-2b ^ 2 / A ^ 2b-2ab ^ 2

（1）m^2-m^2/m^2+3mn+2n^2
=(m+n)(m-n)/[(m+n)(m+2n)]
=(m-n)/(m+2n)
(2)a^2-ab-2b^2/a^2b-2ab^2
=(a-2b)(a+b)/[ab(a-2b)]
=(a+b)/ab
=-18/12
=-3/2