數學題 about%
回答 (3)
✔ 最佳答案
朱 x 90% - $320 = 朱 x 70%
90%x - 320 = 70%x
90%x-70%x=320
(90%-70%)x=320
20%x=320
x=320 / 20%
x = 320/
x = 1600
朱古力 = 1600
Let 一盒朱古力蛋糕 be $x
9折朱古力蛋糕 = 0.9x
7折朱古力蛋糕 = 0.7x
0.9x-0.7x = $320
0.2x = $320
x = $320/0.2
x = $1600
一盒朱古力蛋糕 is $1600
參考: me
320 / 0.2 = 1600
1600*0.9 = 1440
1600*0.7 = 1120
收錄日期: 2021-04-18 22:42:30
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