32 27 72 87 Calculation process

The fourth refers to the calculation rules of addition, subtraction, multiplication, and division. In mathematics, when the first-level operation (addition and subtraction) and the second-level operation (multiplication and division) appear in a formula at the same time, their order of operation is first multiplication and division, then addition and subtraction, if there are parentheses, first count the parentheses in the brackets and then count the parentheses, the same level of operation order is from left to right, such operations are called four operations.

The rule of four operations:

1. Calculation rules for addition and subtraction of integers:

1) To align the same digits, and then put the same counting unit.

add or subtract the numbers on ;

2) Whoever reaches the age of ten will advance to the previous one.

2. Calculation rules of decimal addition and subtraction:

1) Calculate decimal addition and subtraction, first align the decimal points of each number (that is, align the numbers on the same digit);

2) Then calculate according to the rules of integer addition and subtraction, and finally align the decimal point on the horizontal line in the obtained number. (There is a 0 at the end of the decimal part of the number, and the 0 should be removed in general.) ）。

3. Calculation rules for addition and subtraction of fractions:

1) Denominator. When the same is the case, only the numerator is added and subtracted, and the denominator remains unchanged;

2) When the denominator is not the same, it is necessary to divide the fraction with the same denominator first, and then add and subtract.

4. Integer multiplication rule:

1) From the right, multiply the first factor by the number on each of the second factor, and the end of the number will be aligned with which digit of the second factor is the same as which digit of the second factor;

2) Then add up the numbers that you have multiplied several times. (Multiplication with 0 at the end of an integer: you can first multiply the numbers before 0, and then see how many zeros there are at the end of each factor, and add a few zeros to the end of the multiplied number.) ）

5. Decimal multiplication rule:

1) Calculate the product according to the rule of integer multiplication;

2) If you look at how many decimal places there are in the factor, count the number from the right side of the number, and point to the decimal point;

3) There is 0 at the end of the decimal part of the number, and the 0 should be removed in general.

6. Fraction multiplication rule:

Multiply the numerator of each fraction as the numerator, multiply the denominator of each fraction as the denominator (i.e., multiply by the reciprocal of the fraction), and then divide the fraction.

7. The division rule of integers:

1) From the dividend.

At the beginning of the quotient, first look at how many digits there are in the divisor, and then use the divisor to try to divide the first few digits of the dividend, if it is smaller than the divisor, try to divide by one more digit;

2) Divide to the digit of the dividend, write the quotient on that digit;

3) The remaining number after each division must be smaller than the divisor.

8. The divisor is the decimal division rule of an integer:

1) Remove according to the law of integer division, and the decimal point of the quotient should be aligned with the decimal point of the dividend;

2) If there is still a remainder at the end of the dividend.

Just add zero after the remainder, and then continue dividing.

9. The divisor is the decimal division rule for decimals:

1) First look at how many decimal places there are in the divisor, move the decimal point of the dividend to the right by a few places, and make up with zero if the number is not enough;

2) Then divide by decimal division where the divisor is an integer.

10. The division rule of fractions:

1) Multiply the numerator of the dividend by the denominator of the divisor as the numerator;

2) Multiply the denominator of the dividend by the numerator of the divisor as the denominator.

Original question: [(32) (27) (72) 87].

Calculation steps: Remove the parentheses, simplify and then calculate.

[(－32)－(27)－(72)－87]=-32+27+72-87

Negative number + positive number = sign takes the sign of the addition with the greater absolute value, and the value takes the value obtained by "subtracting the smaller absolute value from the larger absolute value".

1. Multiplication. Negative 1 Negative 2 = (Negative 1 Negative 2) = Positive Negative Positive = (Positive Negative) = Negative.

2. Division. Negative 1 Negative 2 = (Negative 1 Negative 2) = Positive Negative Positive = (Negative Positive) = Negative.

In general, the division of the same sign equals a positive number, and the division of a different sign equals a negative number.

Original Blind Suspect = (2 9 6-5 Zhi Tong 3) * 6

2 9 6* Grinding 6-5 3* 6

Summary. -32)-(27)-(72)-87=-32+27-(-72)-87 (change the double negative sentence to addition) = -32+27+72-87 gives a positive number) = 20 (merge similar terms) Therefore, the answer is -20

32)-(27)-(72)-87 process.

32)-(27)-(72)-87=-32+27-(-72)-87 (change the double negation of the sentence to addition) = -32+27+72-87 to get a positive early answer number) = 20 (merge similar terms) Therefore, the answer is -20

Hello, hello.

First, this large converts subtraction into addition, i.e. $(-32)-(27)-(72)-87$ can be written as $(-32)+27+(-72)+(87)$. After Ransen is pure vertical, add the values, that is, pants $(-32)+27+(-72)-87=-164$. Finally, use an equal sign to connect the result with the answer, i.e., $(-32)-(27)-(72)-87=-164=456$

You can help me look up the six numbers in the middle.

You can help me look up the middle six numbers of 158.

1. Calculate the parentheses first: 367 minus 258 equals 109.

2. Substitute the result into the expression of making spikes: 81 minus 109 equals minus 28.

3. Finally, take the bright calculation and division: 595 divided by negative pure Min Bu 28 equals negative.

The result of this calculation is 42

Let's do the math first, which is [(57+33) 30].

There is (), you need to calculate the number in () first, 57 + 33 = 90

Count 57 + 33 = 90 in parentheses

The answer is 42