求下列各題中的新值或減值。
1)把70m增加150%。
2)把125ml減少10%。
求下列各題中的未知數。
1)若yL增加了9%，增值是9.9L。
2)若A減少了55%，新值是180。
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2007-01-24 1:46 am
回答 (2)
2007-01-24 2:11 am
新值或減值
1) 70m 増加了150%, 70m +( 70m x 150%) =70m + 105 m = 175m
2) 125ml減少10% , 125ml - (125ml x 10%) = 125ml - 12.5ml = 112.5ml
未知數
1) yL 增加 9%=9.9L , yL + (yL x 9%) = 9.9L
yL + 0.09yL = 9.9L
1.09yL =9.9L
y =9.083 (3 d.p.)
2) A 減少 55% = 180, A - (A x 55%) = 180
A - 0.55A = 180
0.45A = 180
A = 400
1) 70m 増加了150%, 70m +( 70m x 150%) =70m + 105 m = 175m
2) 125ml減少10% , 125ml - (125ml x 10%) = 125ml - 12.5ml = 112.5ml
未知數
1) yL 增加 9%=9.9L , yL + (yL x 9%) = 9.9L
yL + 0.09yL = 9.9L
1.09yL =9.9L
y =9.083 (3 d.p.)
2) A 減少 55% = 180, A - (A x 55%) = 180
A - 0.55A = 180
0.45A = 180
A = 400
2007-01-24 1:53 am
1. 175m
2. 112.5ml
1.y=9L+9/109L
2.A=400
2. 112.5ml
1.y=9L+9/109L
2.A=400
收錄日期: 2021-04-12 23:03:26
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070123000051KK02569