1.己知x>5,以等式表示下列各題中的y值
a)y=1/5x b)y=7x-4
2)解下列各題的不等式
a)3+4x>67
3)解下列各題的不等式
a)3x>17-1/11x
列埋步驟pls!!
F.3-F.4 數學問題
2007-08-09 10:49 pm
回答 (2)
2007-08-09 11:04 pm
✔ 最佳答案
1a) y= 1/5 * 5 =1 (sub x=5)x>5, y>1
1b) y=7x-4 = 35-4= 31 (sub x=5)
x>5, y>31
2a) 3+4x>67
3+4x-3>67-3
4x>64
x>16
3a) 3x>17-1/11x
3x+1/11x>17
34/11x >17
x >11/2
2007-08-09 11:00 pm
a)..........y = 1/5x
...........5y = x
...........5y > 5.........因為x>5
.............y > 1
b)..........3+4x > 67
.................4x > 64
...................x > 16
c)..........3x > 17-1/11x
...3x+1/11x > 17
...(3+1/11)x > 17
...............x > 17/(3+1/11)
...............x > 5.5
...........5y = x
...........5y > 5.........因為x>5
.............y > 1
b)..........3+4x > 67
.................4x > 64
...................x > 16
c)..........3x > 17-1/11x
...3x+1/11x > 17
...(3+1/11)x > 17
...............x > 17/(3+1/11)
...............x > 5.5
參考: 計出來
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