# 文字題 一元一次不等式 幫幫我呀 thx 10分

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• Anonymous

plus minus times divided by equals

1.

x times 3 plus 4 smaller or equals to 11

x times3 smaller or equals to -15

x smaller or equals to -5

2.

Suppose the two continuous odd numbers are x and x plus 2.

x plus (x plus 2) smaller or equals to 80

x times 2 plus 2 smaller or equals to 80

x plus 1 smaller or equals to 40

x smaller or equals to 39

So the smaller one smaller or equals to 39.

3.

Suppose the two continuous even numbers are x minus 2 and x.

(x minus 2) plus x larger or equals to 36

x times 2 minus 2 larger or equals to 36

x minus 1 larger or equals to18

x larger or equals 19

But because of x is even numbers ,so x larger or equals 20

4.

Suppose a can coca cola&#39;s amount is a.

6 times 45 plus 6a smaller or equals to 300

270 plus 6a smaller or equals to 300

6a smaller or equals to 30

a smaller or equals to 5

So he can buy 5 can coca cola at most.

Source(s): 自己
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• 1.

3x+4&lt;-11

3x&lt;-11-4

3x&lt;-15

x&lt;-5

ans:x&lt;5

2.

兩奇數係x同x+2

x+x+2&lt;80

2x+2&lt;80

2x&lt;78

因為x&lt;39

x=37

ans:37

3.

兩偶數係x同x+2

x+x+2&gt;36

2x+2&gt;36

2x&gt;34

x&gt;17

x=18

ans:18

4.

300-45x6=30

30/6=5

ans:5

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• 已知3乘以x加上4小於－11,求x值的可能範

3x+4&lt;-11

3x+4-4&lt;-11-4

3x&lt;-15

x&lt;-5

可能範圍.x&lt;-5

若兩個連續奇數的和不大於80,求當中較小的數的最大可能值.

.(x+1)(x+3)&lt;80

x^2+x+3x+3&lt;80

x^2+4x-77&lt;0

(x+11)(x-7)&lt;0

x+11&lt;0 or x-7&lt;0

x&lt;-11(rej) or x&lt;7

最大可能值x&lt;7

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