１部ｐｃ以七折和八折出售、售價差１２５０元、ｐｃ原價是多少？
謝謝解答的人
一條小六數題不太明白。。。
2010-02-26 4:44 am
回答 (4)
2010-02-26 9:12 am
七折=70%
八折=80%
設pc既原價係a
a (80%) - a (70%) = 1250
a (80%-70%) = 1250
a (10%) = 1250
a = 12500
佢既原價就係12500喇
check:
12500 x (80%-70%)
=12500 x 10%
=1250
八折=80%
設pc既原價係a
a (80%) - a (70%) = 1250
a (80%-70%) = 1250
a (10%) = 1250
a = 12500
佢既原價就係12500喇
check:
12500 x (80%-70%)
=12500 x 10%
=1250
參考: me
2010-02-26 5:27 am
感恩、謝謝你的回答。
2010-02-26 5:21 am
設pc的原價為y
80%y-70%y=1250
0.8y-0.7y=1250
0.1y=1250
y=12500
80%y-70%y=1250
0.8y-0.7y=1250
0.1y=1250
y=12500
2010-02-26 4:50 am
設 原價為x
0.7x+1250=0.8x
0.1x=1250x
x=$12500
0.7x+1250=0.8x
0.1x=1250x
x=$12500
收錄日期: 2021-04-19 21:27:49
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20100225000051KK01369