Let u = {(x, y) | x belong to R, y belong to R}, a = {(x, y) | 2x-y + a > 0}, B = {(x, y) | x + 2y-b ≤ 0}, then p (1,4) belongs to cub If and only if

Let u = {(x, y) | x belong to R, y belong to R}, a = {(x, y) | 2x-y + a > 0}, B = {(x, y) | x + 2y-b ≤ 0}, then p (1,4) belongs to cub If and only if

b2

Finding process (2x-y) (2x + y) + 2x (x-2y) (x / 2 + 3) &# 178; - (x / 2-3) &# 178; (2a-b) &# 178; - 4 (a + b) (a-2b)

(2x-y)(2x+y)+2x(x-2y) =4x²-y²+2x²-4xy=6x²-4xy-y²(x/2+3)²-（x/2-3)² =(x/2+3+x/2-3)(x/2+3-x+3)=6x(2a-b)²-4(a+b)(a-2b)=4a²-4ab+b²-4(a²-ab-2b²)=...

Simplification: (1) - 2x & # 178; × 3xy & # 178; = (), (2) 2A - (a-b) = (), (3) 3 (x + y) - 2 (x-2y) = ()
Calculation: (1) the 5th power of a × A & # 178; = (), (2) the 5th power of a △ A & # 178; = (), (3) (A & # 178;) &# 179; = (), (4) (B of a) &# 178; = ()
The decomposition factors are: (1) a & # 179; - AB & # 178; (2) 3AB & # 178; + A & # 178; B
First simplify, then evaluate: (a-radical 3) (a + radical 3) - A (a-6), where a = (radical 5) + 1 / 2

Simplification: (1) - 2x & # 178; × 3xy & # 178; = (- 6x & # 179; Y & # 178;)
　　　（2）2a-(a-b)=（a+b）
　　　（3）3（x+y）-2（x-2y）=（x+7y）
Calculation: (1) the 5th power of a × A & # 178; = (the 7th power of a)
(2) the fifth power of a △ A & # 178; = (A & # 179;)
(3) (A & # 178;), # 179; = (the 5th power of a)
(4) (B of a) = (a) = (178; B of a) = (178;)
Decomposition factor: (1) a & # 179; - AB & # 178; = a (a + b) (a-b)
　　　（2）3ab²+a²b=ab(a+3b)
First simplify, then evaluate: (a-radical 3) (a + radical 3) - A (a-6), where a = (radical 5) + 1 / 2
(a-radical 3) (a + radical 3) - A (a-6)
　= (a² - 3) - (a² - 6a)
　= a² - 3 - a² + 6a
　= 6a - 3
When a = (radical 5) + 1 / 2
Original formula = 6 [(radical 5) + 1 / 2] - 3
= 6√5 + 3 - 3
= 6√5