设购买甲a棵,乙n-a棵.
5a+8(n-a)=2600 a=(8n-2600)/3
0.9a+0.95(n-a)≥0.92n 3n≥5a.
将1式代入2式:
3n≥5(8n-2600)/3
9n≥40n-13000
13000≥31n
419.35≥n
n最大419.
设购买甲a棵,乙n-a棵.
5a+8(n-a)=2600 a=(8n-2600)/3
0.9a+0.95(n-a)≥0.92n 3n≥5a.
将1式代入2式:
3n≥5(8n-2600)/3
9n≥40n-13000
13000≥31n
419.35≥n
n最大419.