(1)a=-2，b=3
A=.....................
(2)a=-3，b=-4
A=.......................
已知B=a^3+3a^2b+3ab^2+b^3，求下列各情況中B的值。
(1)a=2，b=-2
B=....................
(2)a=-3，b=3
B=.....................
(3)a=1/2，b=-1/2
B=.................
更新1:
唔該列埋式=]
簡單中一數
2008-09-07 3:50 am
已知A=a^2-2ab+b^2，求下列各情況中A的值。
(1)a=-2，b=3
A=.....................
(2)a=-3，b=-4
A=.......................
已知B=a^3+3a^2b+3ab^2+b^3，求下列各情況中B的值。
(1)a=2，b=-2
B=....................
(2)a=-3，b=3
B=.....................
(3)a=1/2，b=-1/2
B=.................
(1)a=-2，b=3
A=.....................
(2)a=-3，b=-4
A=.......................
已知B=a^3+3a^2b+3ab^2+b^3，求下列各情況中B的值。
(1)a=2，b=-2
B=....................
(2)a=-3，b=3
B=.....................
(3)a=1/2，b=-1/2
B=.................
回答 (3)
2008-09-08 2:33 am
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
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
2008-09-07 5:18 am
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！
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！
2008-09-07 4:05 am
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.
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.
參考: Me
收錄日期: 2021-04-24 23:22:19
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20080906000051KK02430