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1高中平面向量填空题设向量a,b满足,a=3,b=4,向量a,b的向量积=0.a,b,a-b的模为边长
高中平面向量填空题设向量a,b满足,a=3,b=4,向量a,b的向量积=0.a,b,a-b的模为边长构成三角形与半径为一的圆的公共点最多为4个,不知道怎么为什么.
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2白肋烟实物样品,每把烟叶应有（)片叶。A.15～20B.20～25C.25～30D.25～40
白肋烟实物样品,每把烟叶应有()片叶。
A.15～20
B.20～25
C.25～30
D.25～40
请帮忙给出正确答案和分析，谢谢！
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3向量的填空题,
向量的填空题,
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4Mechanical arms and hands are designed for jobs that require everything EXCEPT______.A．str
Mechanical arms and hands are designed for jobs that require everything EXCEPT______.
A．strength
B．precision
C．safety
D．speed
请帮忙给出正确答案和分析，谢谢！
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5加十分,已知向量a=.已知向量a=(cos3x/2,sin3x/2),向量b=(cosx/2,-si
加十分,已知向量a=.已知向量a=(cos3x/2,sin3x/2),向量b=(cosx/2,-sinx/2),x∈[0,π/6] ,求：若f(x)=向量a·向量b － 2λㄧ向量a﹢向量bㄧ²的最小值是3/2,求实数λ的值.
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6Children in Redondo Beach, California walk to school in order to______.A．spend time with t
Children in Redondo Beach, California walk to school in order to______.
A．spend time with their parents
B．reduce childhood obesity
C．walk their dogs on the way to school
D．have a great fun
请帮忙给出正确答案和分析，谢谢！
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7已知向量a ,b满足|a|=6,|b|=8,则|a+b|=|a-b|,求|a+b|
已知向量a ,b满足|a|=6,|b|=8,则|a+b|=|a-b|,求|a+b|
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8What is the mentioned cause of the obesity problem of children？A．The food is unhealthy.B．C
What is the mentioned cause of the obesity problem of children？
A．The food is unhealthy.
B．Children are stressed out.
C．Children exercise less.
D．Parents are careless.
请帮忙给出正确答案和分析，谢谢！
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9已知向量a=(2,1),向量b=(-8,6)（1）已知向量a=（-1,2）,向量b=（1,-2）求向
已知向量a=(2,1),向量b=(-8,6)（1）已知向量a=（-1,2）,向量b=（1,-2）求向量a+向量b,向量a-向量b,2向量a-3向量b的坐标.（2）已知向量a=（2,1）,向量b=（-8,6）,向量c=（4,6）,求2向量a+5向量b-向量c,并用基底向量i,j将该向量表示出来
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10已知向量a、b满足|a+b|=8,|a-b|=6,求a•b
已知向量a、b满足|a+b|=8,|a-b|=6,求a•b
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