Now it is stipulated that a * b = AB + A-B, where a and B are rational numbers, then what should a * B + (B-A) * (B + a) be equal to?

Now it is stipulated that a * b = AB + A-B, where a and B are rational numbers, then what should a * B + (B-A) * (B + a) be equal to?

Now it is stipulated that a * b = AB + A-B, where a and B are rational numbers, then what should a * B + (B-A) * (B + a) be equal to?
a*b+（b-a)*(b+a）
=ab+a-b+（b-a)×(b+a）+（b-a)-(b+a）
=ab+a-b+b²-a²+b-a-b-a
=ab-b+b²-a²-a

It is stipulated that an operation a ⁃ B = AB + A-B, where a and B are real numbers, then a ⁃ B + (B-A) ⁃ B equals ()
A. a2-bB. b2-bC. b2D. b2-a

A ∧ B + (B-A) ∧ B, = AB + A-B + (B-A) × B + (B-A) - B, = AB + A-B + b2-ab + b-a-b, = b2-b

It is stipulated that an operation a ⁃ B = AB + A-B, where a and B are real numbers, then a ⁃ B + (B-A) ⁃ B equals ()
A. a2-bB. b2-bC. b2D. b2-a

A ∧ B + (B-A) ∧ B, = AB + A-B + (B-A) × B + (B-A) - B, = AB + A-B + b2-ab + b-a-b, = b2-b

If rational numbers a and B satisfy (a + 1) + 7 (a + b) = 0, then AB is equal to?

a=-1,b=1,ab=-1!
Belongs to 0 + 0 type question!

（23-14-38+524）×（-48）

（23-14-38+524）×（-48），=23×（-48）-14×（-48）-38×（-48）+524×（-48），=-32+12+18-10，=30-42，=-12．

7 out of 12 times 8 out of 21 =?

2 / 9

21 of 22 to 8 x = 7 to 12
In the way of solving proportion

21/22:x/8=7:12
x/8 *7 =21/22 *12
7/8x=126/11
x=126/11 *8/7
x=144/11

1 / 4 1.21 - 256 2 and 2 / 49 do these four have square roots? No reason

1 / 4 = 1 / 2 × 1 / 2
So the square root of 1 / 4 is plus or minus 1 / 2
1.21=1.1×1.1
So the square root of 1.21 is plus or minus 1.1
-256 negative numbers have no square root. Please remember that there is no reason. Both numbers are square and non negative
2 and 2 of 49 = 100 of 49 = 10 of 7 × 10 of 7
So the square root of 2 and 2 out of 49 is plus or minus 10 out of 7

Add 1 and 5 / 6 to a number, and then subtract 0.75. The result is 5

This number = 5 + 0.75-1 and 5 out of 6 = 3 and 11 out of 12

What is the difference between 5 / 6 of 15 and 3 times of 5 / 6

15 times 5 / 6-3 times 5 / 6 = 45 / 6-15 / 6 = 30 / 6 = 5