一元一次不等式 [ form.5 ]

👨🏻‍🏫 學術台數學

[匿名]

2007-09-07 5:39 am

1. (2ｘ/3)-5≦ｘ/2
p.s. 即2ｘover3減以5小於或等於ｘover2

2. (5+2ｘ)/3≧(2-3ｘ)/4
p.s. 即5加2ｘover3大於或小於2減3ｘover4

詳細步驟 .. thx =]

回答 (2)

用戶195274

2007-09-07 5:44 am

✔ 最佳答案

1. 2x/3 - x/2 <= 5
4x/6 - 3x/6 <= 5
x/6 <= 5
x <= 30

2. (5+2x)/3 * 12 >= (2-3x)/4 * 12
4(5+2x) >= 3(2-3x)
20+8x >= 6-9x
17x >= -14
x >= -14/17

參考: me

👍 0 👎 0

小瓦器

2007-09-07 5:45 am

1. 4x - 30 <= 3x (both sides times 6)
x <= 30

2. 4(5+2x)>= 3(2-3x) (both sides times 12)
20 + 8x >= 6 -9x
17x >= -14
x >= -14/17

👍 0 👎 0