(fill in the blanks with unequal sign) because | - 3 | - 4 |, so - 3 - 4 (fill in the blanks with unequal sign) because | - 3 | - 4 |, so - 3 - 4

(fill in the blanks with unequal sign) because | - 3 | - 4 |, so - 3 - 4 (fill in the blanks with unequal sign) because | - 3 | - 4 |, so - 3 - 4

Because | - 3 | < | - 4|
So - 3 > - 4

Fill in the blanks with unequal signs and summarize the rules
/(+5)+(+7)/_______ /+5/+/+7/
/(-5)+(-7)/_______ /-5/+/+7/
/(-5)+(+7)/_______ /-5/+/+7/
/(+5)+(-7)/_______ /+5/+/-7/
law:
Fill in the blanks with unequal signs

=,=,

It is known that a = 3M ^ 2-2n ^ 2 + Mn, B = 5mn-6m ^ 2
And A-B + 3C = 0

According to the condition, 3C = b-a
Simplify B-A = 3C = 2n ^ 2 + 4mn-9m ^ 2

Given that the difference between the square of polynomial 2x + my-12 and the square of polynomial NX - 3Y + 6 does not contain x, y can find the value of square of 3m-n + Mn

2x²+my-12-(nx²-3y+6)
=2x²-nx²+my+3y-12-6
=(2-n)x²+(m+3)y-18
According to the meaning of the title:
2-n=0
m+3=0
Namely:
n=2
m=-3
So:
3m-n²+mn
=-9-4+(-6)
=-13-6
=-19