1.(x+100)/240－x/280≥0.6 2.(1-5%)x≥1.5
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1.(x+100)/240－x/280≥0.62.(1-5%)x≥1.51.(x+100)/240－x/280≥0.62.(1-5%)x≥1.51.(x+100)/240－x/280≥0.62.(1-
1.(x+100)/240－x/280≥0.6 2.(1-5%)x≥1.5
1.(x+100)/240－x/280≥0.6 2.(1-5%)x≥1.5
1.(x+100)/240－x/280≥0.6 2.(1-5%)x≥1.5
1,240与280最小公倍数是1680,所以两边同时乘以1680得
7（X+100）-6X≥1008
7X+700-6X≥1008
X≥308
2,0.95X≥1.5
X≥30/19
1.(x+100)/240－x/280≥0.6 2.(1-5%)x≥1.5
（X+X)+(X-X)+(X*X)+(X/X)=100
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x/240-x/280=2..
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