How to do math quickly and urgently, math how to do it urgently

1. Original formula = -2 + 3x = 12x 3Original = x+1-2x+1=4 4Original = 4 * (2x-1) = 3 * (5 x + 1).

9x=-2 3-3x-2x+16=6 x=-2 8x-4=15x+3x=-2/9 5x=13 7x=-7

x=13/5 x=-1

5y=4 y=4/5

6.Both sides of the equation are multiplied by 6Original = 8-48x = 18-33x15x = -10

x=-10/15

x=-2/3

7.Multiply 12 on both sides of the equation

Original = 8y- 4 = 3y + 6-12

y=-2/5

8.Both sides of the equation are multiplied by 6

Original = 6x-2- 12 + 6x + 12 = 18x-186x = 16x = 16 6 = 8 3

Telling you the answer is also a palliative, not a cure, and I will never do it myself.

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Strongly agree with what was said upstairs:

1.It is very important to do math problems (you can't do it blindly, you can do it selectively according to the questions that the teacher usually talks about; If you don't know how to do the questions, you can take a look at the answers and remember, don't copy them, and see if you can write the correct answers for yourself).

2.Listen carefully to the class (whether you like the teacher or not, it is best to listen to the class, and then take notes, because the teacher has digested what the teacher has said, and then let you accept it, you can subtly learn the way he thinks about the topic; If you can't keep up with the class, you skip it, you can't not understand this question, and you don't hear the next one)

3.About note-taking (no matter how simple the teacher says the classmates think, as long as you think you don't understand or are useful to you, you have to write it down, and you can review it later with red or conspicuous colors; Don't copy other people's notes, be sure to do it yourself, because you don't understand it the same way as others)

4.Questions you don't understand (think about it yourself, you may not be able to think of it, but it will also increase your familiarity with the topic, and then ask the teacher and classmates, you must not be ashamed to ask).

is a positive number and b is a negative number.

is a negative number, and b is a negative number.

is a positive number, and b is a positive number.

is a negative number and b is a positive number.

<> "According to the order in which you send the picture, please take it."

When the original price was A, there was.

a×(1-10%)-m=n

So a=(m+n) (1-10%)

Choose B2When the cost price is a, there is.

a×(1+40%)×80%-a=15

a=125 for b3The original price was A, and there was.

80%a-150=10

a=160÷80%

a=200, so the original price was 200 yuan.

Solution 1: N+M is ** after the price reduction is 10%, then the original price is (N+M) 1-10%, select B

2.Solution: Set the cost price to x yuan.

x(1+40%)·80%-x=15

x=125 yuan.

5.Solution: Set the price to X yuan.

80%x-150=10

x=200

4, y1+y2=0, list Shenqing's equation about x, solve x=-25 145, let a need x, then b needs (2 3) x.

x+2x Swim Change Grip 3=200

x=120 so 120 for a, 80 for b.

Cost: 120 * 40 + 80 * 60 = 9600 (yuan) ambush.

The first question is selected B, process: current price n + price reduction m = original price (1-10%).

The second talk about the cheat question B, the process: cost price (1 + 40%) x 80% = cost price + 15, calculate the cost price = 125 yuan.

The third question: 200x+50(22-x)=1400, the solution is x=2 The fourth question refers to shouting: the interest after one year is yuan; Taxed at 5%, the take-home interest is 225x (1-5%) including family = yuan.

Uh, that's a lot, didn't your teacher talk about it, it's up to you.