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正六棱锥P-ABCDEF中,G为PB的中点,则三棱锥D-GAC与三棱锥P-GAC...
正六棱锥P-ABCDEF中,G为PB的中点,则三棱锥D-GAC与三棱锥P-GAC体积之比为( )
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A.1:1
B.1:2
C.2:1
D.3:2
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某店一个月的收入和支出总共记录了N个数据a
1,a
2,…a
N,其中收入记为正数,支出记为负数.该店用下边的程序框图计算月总收入S和月净盈利V,那么在图中空白的判断框和处理框中,应分别填入下列四个选项中的( )
A.A>0,V=S-T
B.A<0,V=S-T
C.A>0,V=S+T
D.A<0,V=S+T
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A.-
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B.-
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在点(1,-1)处的切线方程为( )
A.y=x-2
B.y=-3x+2
C.y=2x-3
D.y=-2x+1
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设等比数列{a
n}的前n项和为S
n,若
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=3,则
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