(+3)-(-5)=(+3)+(+5) and then calculate according to ① method;

(-3)-(+5)=(- 3)+(- 5) and then calculate by ② method;

(+3)-(+5)=(+3)+(-5) and then calculate by ③ method.

Extended data:

The core is negative and positive, and positive is negative.

Multiplication takes a column: 6×(-5)=-30 (here, it is positive and negative multiplication, digital multiplication, preceded by a negative sign. )

Division takes a column: (-10)÷(-5)=2 (here is the division of two negative numbers, and the number is divided by a plus sign (omit the plus sign). )

Add a column: 12+(-5)= 12-5=7 (adding a negative number is equivalent to subtracting a positive number from this number).

The same is true for subtraction: (-5)-(-8)=(-5)+8=8-5=3.

Negative number 1× negative number 2= (negative number 1× negative number 2) = positive number

Negative x positive =-(positive x negative) = negative.

Negative 1÷ negative 2= (negative 1÷ negative 2) = positive.

Negative/positive number =-(negative/positive number) = negative number

If all negative numbers are less than zero, then all negative numbers are less than positive numbers. Zero is neither positive nor negative. Then -a

There is neither a minimum number nor a maximum number in negative numbers.

The minus sign before a negative number is equal to the absolute value of the negative number.

Such as -2, -5.33, -45, etc. The absolute value of 2 is 2, the absolute value of -5.33 is 5.33, the absolute value of -45 is 45, and so on.

The score can also be negative, such as -2/5.

The square root of a negative number is represented by the imaginary unit "I".