中一數學百分増加和減少 急!

Formula :
(新值 - 原值)/原值 * 100%

1)
(11 - 10)/10 * 100%
= 1/10 * 100%
= + 10%

2)
(10 - 16)/16 * 100%
= -6/16 * 100%
= - 37.5%

3)
(22 - 8)/8 * 100%
= 14/8 * 100%
= + 175%

4)
(14.5 - 25)/25 * 100%
= -10.5/25 * 100%
= - 42%

1)11-10分之10x100%
=1分之10x100%
=+10%

2)10-16分之16x100%
=--6分之16x100%
=--37.5%

3)22-8分之8x100%
=14分之8x100%
=+175%

4)14.5-25分之25x100%
=10.5分之25x100%
=--42%

公式=(新-原)/原*100%
+??%=増加 ，-??%=減少

1)__(11-10)/10*100%
____=1/10*100%
____=+10%
SO増加了10%


2)__(10-16)/16*100%
____=-6/16*100%
____=-37.5%
SO減少了37.5%


3)__(22 - 8)/8*100%
____=14/8*100%
____=+175%
SO増加了175%


4)__(14.5-25)/25*100%
____=-10.5/25*100%
____=-42%
SO減少了42%

1. (11-10)/ 10 *100% = 10%
2. (16-10)/16 *100% = 37.5%
3. (22-8)/8 *100% = 175%
4.(25-14.5)/25 *100% = 42%