Negative math problems, please solve the problem to write each step completely, all heroes

Here are a few rules for you.

Move 3x-5x=-6+ Merge Homogeneity -2x= x=20-(3x+1)=4 20-3x-1=4 -3x=4-20+1=-15 x=5

x-(3-2x)=27 x-3+2x=27 3x=27+3=30 x=10

x+5(3-x)=11 x+15-5x=11 -4x=11-45=-4 x=1

Arithmetic: 9 11 -19

Calculation: -43 62500

Solve the equation: 5 10 1

The process is written by itself.

The people who read it feel so tired ...... write

Negative number - negative number = negative number = negative number + negative number = negative number + negative number = 487 + 172 = 659, because the negative number 100 and the ten digit number are interchangeable, so the previous negative number 569-487 = 82

1.A student participates in a quiz competition, there are 6 test questions, and the scoring criteria are as follows: 1 point is added for a correct answer, 1 point is deducted for an incorrect answer or not answering a question, and the student's final score is 2 points, and the student is asked how many questions he answered correctly? (Write out the equation).

Solution: Set the answer to the correct x.

1x-1(6-x)=2

x=4 or: arithmetic solution.

6 1 2 4 points.

Incorrect answer: 4 divided by (1 1) equals 2 (2 points difference between an incorrect answer and a correct answer) Correct answer: 6 2 4 questions.

It belongs to the problem of chickens and rabbits in the same cage, see details.

2.There are (2) numbers on the number line that are per unit length from the origin. (write the most practical way) is 4 5 and minus 4 5

Correct x, incorrect and uny

x+y=6x-y=2

x=4, y=2

There are two, one on the left and one on the right.

Set the correct answer x and the wrong answer or not answer y answer.

Vertical equations. x-y=2

x+y=6 gives x=4

y=2, so 4 correct answers.

2, one positive and one negative.

1.Solution: Suppose the student answers X questions correctly.

x-(6-x)=2

2x=8x=42.Two.

1. 3 floors below the ground level.

2. (20-1)*3=57 (m).

Rice. meters, which is equivalent to 3 floors down, is recorded as -3 floors.

5. (28-(-5)-1))*3=96 (m).

What does 1)-3 mean? 3 basement floors.

2) How many meters did you ascend from the elevator from the +1 floor to the +20 floor? 19 meters.

3) How many meters does the elevator descend from the +1 floor to the 1st floor? 2 meters.

4) I descended 9 meters from the elevator from the +1 floor, which floor did I get to and what is this floor recorded? 8th Floor Notes-8

5) How many meters does the elevator rise from the -5th floor to the +28th floor? 23 meters.

Three basement floors. 57 meters.

6 meters. 2nd basement floor, -2nd floor.

66 meters.

Regardless of a negative number, the question asks "How many kilometers per hour is the speed of this car?" ”

Just count the distance the car has traveled, whether it is going south or north.

Speed = (2 +3+1+5+6+6+5+1+3+2+0+3+1+4+2) 2 = 44 2= 22 km/h.

Sum of absolute values of all numbers = 44

The speed of the car is 44 2 = 22 km/h.

1.A multiple-choice question.

The following statement is incorrect (d).

a.Forward -20m means 20m backward

b.Revenue - 30,000 yuan means a decrease of 30,000 yuan in income.

c.The opposite meaning of a deposit is withdrawal.

d-100 BC means 100 A.D.

There is no such thing as pre-Convention - 100 years.

A true/false question.

An increase of -$5 means a decrease of $5 (right).

Multiple choice question B

Revenue - 30,000 yuan means expenditure of 30,000 yuan instead of income decrease of 30,000 yuan, if it is income increase - 30,000 yuan then it means income decrease of 30,000 yuan.

True or False.

Income - 30,000 yuan means expenditure of 30,000 yuan).

2, right ( ).

1. The wrong one is d. The reason is that there is no single year between BC and AD, that is, 0 in the numberTherefore, this statement is wrong.

True or False.

Question 1c

Question 2: True.

, income - 30,000 yuan means expenditure of 30,000 yuan, people may have a high income! The answer to the true/false question is correct.

The multiple-choice question is C deposit, and the opposite is a loan.

True or False.

The multiple-choice questions are all correct, and the true/false questions are correct.

30 minus fifth.

One in fifteen.

Thirteen out of six.

, minus fifth.

5. One-fifteenth.

6, two and one-sixth.

3 0 minus 5 1 in 15 minus 4 and 3.

3 0 minus 5 1 in 15 minus 13 out of 13.

1.Dad's salary is $3,280, which can be recorded as +$3,280, and all expenses are $1,650, which can be recorded as (- $1,650).

2.A packaging bag is marked with: net weight (150 + 5 grams), indicating that the standard quality of this biscuit is (150) grams, and the actual minimum per bag is not less than (150) grams.

Knowledge of positive and negative numbers.

Positive number + positive rubber punch = positive number.

Negative number + negative number = negative number.

Positive x positive = positive.

Positive number beam pat x negative number = negative number.

Negative x Negative = Positive.

3x(+6)Greeting=+18

5x（-2）=-10

2x（-5）=+10