若6≤a≤10,a≤b≤2a,c=a-b,求c的取值范围.

若6≤a≤10,a≤b≤2a,c=a-b,求c的取值范围.

答案

解析

:∵a≤b≤2a,

-2a≤-b≤-a.

∴-a≤a-b≤a.

∵c=a-b,因此-a≤c≤a.

∵6≤a≤10,∴3≤a≤5.

∵c≤a≤5,-10≤-a≤-6,

c≥-a≥-10,从而-10≤c≤5.

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