很深的數學題

須然是很簡單的小學生數學題, 但是..., 唉!!!
如果第1題改成 1倍(答案會是 0), 及第4題亦改成1倍(答案會是200), 相信可能會少啲人答錯。

1.) B = A * (1 - 5)
= 100 * (1 - 5)
= 100 * - 4
= - 400

2.) = 100 * (1 - 50%)
= 50

3.) = 100 * (1 - 80%)
= 20

4.) = 100 * (1 + 5)
= 600

5.) = 100 * (1 + 50%)
= 150

6.) = 100 * (1 + 80%)
= 180

1.
B=100÷5=20
2.
B=100(1+50%)=150
3.
B=100(1+80%)=180
4.
B=100 X 5 = 500
5.
B=100÷(1-50%)=200
6.
B=100÷(1-80%)=500

1.A=100,B=5A
B=100/5
B=20

2.A=100,B=2A
B=100/2
B=50

3.A=100,B=(1-80%)A
B=0.2A
B=20

1. B =20
2. B =50
3. B =20

1) A = 5B, B = 20
2) (1-50%)A = B, B = 50
3) (1-80%)A = B, B = 20

2007-02-01 23:14:47 補充：
4) B = 5A = 5005) B = (1 50%)A = 1506) B = (1 80%)A = 180

2007-02-01 23:19:08 補充：
Amendments1) B = (1-5)A = -4*100 = -4004) B = (1 5)A = 6*100 = 600

1.= <500
2.= <50
3.= <80