某加工厂用某原料由甲车间加工出A产品,由乙车间加工出B产品.甲车间加工一箱原料需耗费工时10小时,可加工出7千克A产品,每千克A产品获利40元.乙车间加工一箱原料需耗费工时6小时,可加工出4千克B产品,每千克B产品获利50元.甲、乙两车间每天共能完成至多70箱原料的加工,每天甲、乙车间耗费工时总和不得超过480小时,那么要满足上述的要求,并且获利最大,甲、乙两车间应当各生产多少箱?
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.
(Ⅰ)求f(x)的最小正周期:
(Ⅱ)求f(x)在区间
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上的最大值和最小值.
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已知向量
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=(1,-3),
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=(4,2),若
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⊥(
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+λ
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),其中λ∈R,则λ=
.
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已知两个单位向量
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,
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的夹角为
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=
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,则
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=
.
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