How to solve 2x-2-x + 2 = 12-3x!

How to solve 2x-2-x + 2 = 12-3x!

2x-2-x+2=12-3x
2x-x+3x=12+2-2
4x=12
x=3

To solve the system of linear equations of two variables, half x-half y = - 1 2x + y = 3
To solve the problem with the method of addition, subtraction and elimination
Which kind brother and sister help

1/2*x-3/2*y=-1.(1)
2x+y=3.(2)
(1) * 4 - (2) get
-6y-y=-4-3
-7y=-7
Y = 1 is substituted into (2) to get
x=1
So x = 1, y = 1

0,1,2,10,31,54,87,45,91,80,59,79117 find odd, even, prime and composite numbers

Odd: 1 31 87 45 91 59 79 117
Even number: 2 10 54 80
Prime number: 1 2 31 87 59 79
Total: 10 54 45 91 80 117
0 is not any one of odd, even, prime or composite numbers

The length of the Yangtze River in China

6211.3km, the longest river in China

Textbook p73 3A for translation!

What do young people think of the entertainment places in the city? We did a reader survey, and here is the information we got. All the cinemas are very good, but the screen world cinema is the best in the city. It has the largest screen and the most comfortable seats. However, the price of the town cinema is the cheapest, The most popular store is Jason's. The clothes here are of the best quality and low price. Fashion trends are the worst. Its service quality is poor. As for the radio station, most people think jazz 107.9fm is great. The music on this station is very interesting

What is the least common multiple of 16,8,24? 30,10,9?

May I ask: what is the least common multiple of 16, 8 and 24? What is the least common multiple of 30, 10 and 9?
16=2×2×2×2；
8=2×2×2；
24=2×2×2×3；
The minimum common multiple = 2 × 2 × 2 × 3 = 48;
30,10,9 least common multiple?
30=2×3×5；
10=2×5；
9=3×3；
The least common multiple = 2 × 3 × 3 × 5 = 90;
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The ratio of X to 50 percent is equal to the ratio of 0.6 to 0.8. In proportion, the product of two introverts is 3, and the product of two extroverts is x and 3. The ratio of 0.8 to 6 is equal to the ratio of X and 15
List and solve the scale

　　1 x:50％=0.6:0.8 2 3/3=1 3 0.8:6=x：15
0.8x=50％*0.6 6x=0.8*15
x=50％*0.6/0.8 x=0.8*15/6
x=0.375 x=2

When a and B are rational numbers, the size relationship between | a | + | B | and | a + B |

When a and B have the same number,
|a|+|b|=|a+b|
When a and B have different signs,
|a|+|b|＞|a+b|
When one or all of a and B are zero,
|a|+|b|=|a+b|

There are 180 chickens and ducks in Uncle Zhang's family, 20 of which are three times less than ducks?
Do not use formulas or equations,

Analysis: it is known that chickens are 20 times less than ducks, so if 180 + 20 is used, chickens will be three times more than ducks. That is to say, three quarters of the 200 animals are chickens and one quarter are ducks
The number of ducks was (180 + 20) X1 / 4 = 50
The number of chickens: 50x3-20 = 130 (chickens) or 180-50 = 130 (chickens)
A: there are 50 ducks and 130 chickens

If the maximum value of function f (x) = a-bcosx is 5 / 2 and the minimum value is - 1 / 2, find the maximum value and the minimum positive period of function g (x) = 4A sinbx
Sheila

5 / 2 - (- 1 / 2) = 2 | B | B = 3 / 2, B = - 3 / 2, when B = 3 / 2, a + 3 / 2 = 5 / 2, a = 1 g (x) = 4sin (3x / 2) pi / (3 / 2) = 2pi / 3, the maximum value is 4, the minimum value is - 4, and the minimum positive period is 2pi / 3. When B = - 3 / 2, a + 3 / 2 = 5 / 2, a = 1 g (x) = 4sin (- 3x / 2) pi / (- 3 / 2) = - 2pi / 3 + pi = 3