簡單中一數

A:
1) 當a = – 2, b = 3
A = (– 2 – 3)
A = (– 5)


2) 當a = – 3, b = – 4
A = [– 3 – (– 4)]
A = [– 3 + 4)]
A = 1




B:

1) 當a = 2, b = – 2
B = [2 + (– 2)]
B = (2 – 2)
B = 0


2) 當a = – 3, b =3
B = (– 3 + 3)
B = 0


3) 當a = 1/2, b = –1/2
B = [(1/2) + (–1/2)]
B = [(1/2) – (1/2)]
B = 0

已知A = a - 2ab + b，求下列各情況中A的值。

A = a - 2ab + b
A = (a – b)


1) 當a = – 2, b = 3
A = (– 2 – 3)
A = (– 5)
∴ A = 25

2) 當a = – 3, b = – 4
A = [– 3 – (– 4)]
A = [– 3 + 4)]
A = 1
∴ A = 1



已知B = a + 3a b + 3ab + b，求下列各情況中B的值。

B = a + 3a b + 3ab + b
B = (a + b) (a + 2ab + b)
B = (a + b)


1) 當a = 2, b = – 2
B = [2 + (– 2)]
B = (2 – 2)
B = 0
∴ B = 0

2) 當a = – 3, b =3
B = (– 3 + 3)
B = 0
∴ B = 0

3) 當a = 1/2, b = –1/2
B = [(1/2) + (–1/2)]
B = [(1/2) – (1/2)]
B = 0
∴ B = 0



希望幫到您！

1)A=1
2)A=49
1)B=1320
2)B=486
3)B=1.125
It may be wrong. If it is wrong, I am very sorry.
I hope I can help you.