Real numbers are calculated in the following order: first____ And then calculate____ In the end____ If there are brackets, calculate first___ And then____ In the end____ If it is the same level operation, it should be carried out from left to right

Real numbers are calculated in the following order: first____ And then calculate____ In the end____ If there are brackets, calculate first___ And then____ In the end____ If it is the same level operation, it should be carried out from left to right

Real numbers are calculated in the following order: first__ Power and root__ And then calculate__ Multiplication and division__ In the end__ Addition and subtraction__
If there are brackets, calculate first_ Parentheses__ And then__ Bracket__ In the end__ Brace__ If it is the same level operation, it should be carried out from left to right

The relationship between the operational properties of real numbers and the order of size

If A-B > 0, then a > B,
If A-B = 0, then a = B,
If A-B < 0, then a < B,

Real number calculation (there must be a process)
1.√12×√3-5 2.√6×√3/√2 3.(√5+1)^2 4.（√2+1）（√2-1）
5.√2×（√18+√50） 6.√18+√6-√3/√3
7.√80×√5-√50×√2 8.√21×√7/√3
9.（1+√5）（√5-2） 10.（√3-1/√3）^2
11.√8+（-1）^3-2×√2/2 12.√18-（√3+1）^0+(-1)^2

1.√12×√3-5 ＝√36－5＝6-5＝1
2.√6×√3/√2 ＝3√2/√2＝3
3.(√5+1)^2 ＝5＋2√5＋1＝6＋2√5
4.（√2+1）（√2-1）＝2－1＝1
5.√2×（√18+√50）＝√36＋√100＝6＋10＝16 6.√18+√6-√3/√3 ＝3√2＋√6－1
7.√80×√5-√50×√2 ＝√400－√100＝20－10＝10 8.√21×√7/√3 ＝7√3/√3＝7
9.（1+√5）（√5-2） ＝√5＋5－2－2√5＝3－√5
10.（√3-1/√3）^2＝3－2+1/3=4/3
11.√8+（-1）^3-2×√2/2 =2-1＋√2＝1＋√2
12.√18-（√3+1）^0+(-1)^2＝3√2－1＋1＝3√2

On the contrary, the number greater than - 3 must be -- there are four choices a, 0, 1, 2; B, negative; C, non negative; D, the number less than 3

Choose B, because option a is not comprehensive, and there are - 1, - 2. Option C is not negative, which means positive number and 0, which is wrong. If option D is less than 3, then the opposite number of 1 is - 1, which is also wrong, so choose D
In addition, the opposite of a positive number is negative, the opposite of a negative number is positive, and the opposite of 0 is 0

Is "all negative numbers are not greater than zero" right or wrong
In this sentence, not greater than can be understood as less than or equal to
If it is wrong, there is no counter example to prove it wrong

In the end, the study of mathematics is a bit like the study of philosophy
"0 is infinitesimal, but infinitesimal is not 0"
No greater than means less than or equal to

Is positive plus negative greater than zero?
The result of a positive number plus a negative number

Not necessarily. It mainly depends on the absolute value of the positive number and the negative number

How do I compare the sizes of positive, 0, and negative numbers?

Positive number > 0 > negative number
The larger the integer number is, the larger the negative number is

A. a number larger than zero is a positive number, and a negative number must be smaller than zero. B. zero not only means no, but also means No
A。 A number larger than zero is a positive number, and a negative number must be smaller than zero.
B。 Zero not only means no, but also the starting point of measurement. For example, if you pass 60 points, you can record it as 0
c. Zero is neither a positive nor a negative number, but the dividing point between positive and negative
d. A number with a negative sign is called a negative number, and the preceding positive sign of a positive number can be omitted

On the positive, negative and zero description error is: D
For example: - - 3 is a number with a negative sign, but it actually means 3, which is a positive number

A number is either positive or negative______ (judge right or wrong)

Because 0 is neither greater than 0 nor less than 0, 0 is neither positive nor negative

A number cannot be both positive and negative. Is it right or wrong

Wrong, + 0 is 0. - 0 is also 0