math有個唔知點做,中1

2007-07-22 9:20 pm

一個電視賣$8800平至$7744,百分減少係咩??

回答 (6)

2007-07-22 9:27 pm

✔ 最佳答案

$8800減$7744乘100%除$8800...等於12%

舊值-新值
------------- X100%
舊值

參考: ME

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2007-07-22 10:29 pm

7744/8800*100%

=0.88

1-0.88

=0.12

減少12%

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2007-07-22 9:28 pm

(X/100) X 8800 = 7744

8800X /100 = 7744

8800 x = 7744*100

8800 x = 774400

x = 774400 /8800

x = 88%

百分減 = 100 %-88%
= 12%

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2007-07-22 9:27 pm

(新價 - 原價) / 原價 * 100%
=(7744 - 8800) / 8800 * 100%
= -1056 / 8800 * 100%
= -0.12 * 100%
= -12%

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2007-07-22 9:25 pm

$8800-$7744/$8800*100%
=$1056/$8800*100%
=12%

減少12%

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2007-07-22 9:24 pm

百份比變更 = (新值-舊值)/舊值 x 100%
= (7744 - 8800)/8800 x 100%
= -0.12 x 100%
= -12%

即係減左12%

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