怎樣計算：
90/h=y+2
h=?
y=?
(要步驟)
解方程90/h=y+2要步驟
2007-12-20 4:33 am
回答 (3)
2007-12-20 4:47 am
✔ 最佳答案
90/h = y+290 = h(y+2)
h = 90/(y+2)
===================================
90/h = y+2
90 = h(y+2)
90 = hy+2h
90 - 2h = hy
(90 - 2h)h = y
y = (90 - 2h)h
2007-12-19 20:47:45 補充：
y = (90 - 2h)/h
2007-12-20 7:03 am
............90/h=y+2
........90/hxh=(y+2)1/90
..............90=(y+2)h
(y+2)h/(y+2)=90/(y+2)
................h=90/(y+2)
........90/h=y+2
.........y+2=90/h
......y+2-2=90/h-2
.............y=90/h-2
h=90/(y+2)
y=90/h-2
假設h是7代入h=90/(y+2)
90/(7+2)=90/9=10
如果h是10
那麼y=90/h-2便成立
90/10-2=9-2=7
所以h=90/(y+2)和y=90/h-2是對的
........90/hxh=(y+2)1/90
..............90=(y+2)h
(y+2)h/(y+2)=90/(y+2)
................h=90/(y+2)
........90/h=y+2
.........y+2=90/h
......y+2-2=90/h-2
.............y=90/h-2
h=90/(y+2)
y=90/h-2
假設h是7代入h=90/(y+2)
90/(7+2)=90/9=10
如果h是10
那麼y=90/h-2便成立
90/10-2=9-2=7
所以h=90/(y+2)和y=90/h-2是對的
2007-12-20 4:45 am
假如只有以上一項資料，這數式有無限個解。
如h=1, y=88
h=2, y=43
h=3, y=28
...
因此，唯一可說的是對於y是任何一個有理數, h=90/(y+2)
如h=1, y=88
h=2, y=43
h=3, y=28
...
因此，唯一可說的是對於y是任何一個有理數, h=90/(y+2)
收錄日期: 2021-04-13 14:45:44
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20071219000051KK03261