The addition and subtraction of rational numbers can be unified into_____ The calculation is based on the method

The addition and subtraction of rational numbers can be unified into_____ The calculation is based on the method

The addition and subtraction of rational numbers can be calculated by unified addition

The operation method of rational number addition and subtraction is the first_______ Again________ Come on,
also
In addition operations, we generally divided into two steps, first_____ , again____
And: by analogy, what is the relationship between the sign and absolute value of the sum and the sign and absolute value of the two addends?

Determine the sign and add or subtract

Math problem... Help... Fill in the blanks of the first problem... Start from the second problem to process
1. Let a and B be two unequal real roots of the equation x & # 178; + x-2012 = 0, then the value of a & # 178; + 2A + B is
2. It is known that X & # 8321;, X & # 8322; are two real number roots of the quadratic equation x & # 178; - 4x + 1 = 0 of one variable. Find the value problem of (X & # 8321; + X & # 8322;) &# 178; / (X & # 8321; 1 / 2 + X & # 8322; 1 / 2)
3. We have known the equation x & # 178; - 2 (M + 1) x + M & # 178; = 0
(1) when m takes what value, the equation has two real roots?
(2) choose a suitable integer for m, try to have two unequal real roots of the equation, and find out the two real roots

Let a and B be two unequal real roots of the equation x & # 178; + x-2012 = 0,
∴a+b=-1;
a²+a-2012=0;
a+a=2012;
Then the value of a & # 178; + 2A + B is
=a²+a+(a+b)
=2012-1
=2011;
2. It is known that X & # 8321;, X & # 8322; are two real number roots of the quadratic equation x & # 178; - 4x + 1 = 0 of one variable. Find the value problem of (X & # 8321; + X & # 8322;) &# 178; / (X & # 8321; 1 / 2 + X & # 8322; 1 / 2)
x1+x2=4;
x1x2=1;
(X &; + X &;) (# 178; / (X &; 1 / 2 + X &; 1 / 2)
=（x1+x2）²÷(x1+x2)/(x1x2)
=(x1+x2)(x1x2)
=4×1
=4;
3. We have known the equation x & # 178; - 2 (M + 1) x + M & # 178; = 0
(1) when m takes what value, the equation has two real roots?
Δ=4(m+1)²-4m²=8m+4≥0;
∴m≥-1/2;
(2) choose a suitable integer for m, try to have two unequal real roots of the equation, and find out the two real roots
Take M = 0;
In this case, X & # 178; - 2x = 0;
X = 0 or x = 2;
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When writing numbers, start from the high position, write only () and do not write ()
When writing numbers, write from high position, write only (), not write () 0, play () role
There seems to be no mistake on the test paper, but I don't know how to fill it in properly

When writing numbers, start from the high position. First write (the number that is not zero on the highest position) and do not write (the number that is zero on the highest position) 0 plays the role of (occupying position)
For example: license plate number 0053806
Should write: 53806