计算
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=
.
考点分析:
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已知函数f(x)=
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,那么方程f(x)=0在区间[-100,100]上的根的个数是
.
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已知函数
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,若函数f(x)的图象上点P(1,m)处的切线方程为3x-y+b=0,则m的值为( )
A.
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B.
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C.-
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D.-
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如图,阴影部分面积为( )
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A.∫
ab[f(x)-g(x)]d
B.∫
ac[g(x)-f(x)]dx+∫
cb[f(x)-g(x)]d
C.∫
ac[f(x)-g(x)]dx+∫
cb[g(x)-f(x)]d
D.∫
ab[g(x)-f(x)]d
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设函数f(x)=ax
2+b(a≠0),若∫
3f(x)dx=3f(x
),则x
=( )
A.±1
B.
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C.
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D.2
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已知函数y=2cosx(0≤x≤2π)的图象与直线y=2围成一个封闭的平面图形,则这个封闭图形的面积是( )
A.4
B.8
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D.4π
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