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- 食品安全员
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1.若2y-7x=0,则x:y=______.
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2.若X+Y=X,则必有Y=0
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3.若信道的I(X;Y)=0,则
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4.若P{X≥0, Y≥0}=3/7, P{X≥0}=4/7, P{Y≥0}=4/7, 则P{max(X, Y)≥0}=
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5.若x y=,则 |x|=|y|。[ ]
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6.若$$\left| x -y\right|+\sqrt{y+2}=0$$,则x,y的值分别为
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7.若随机变量X与Y的二阶矩有E[XY] = 0,则E[X]E[Y] = 0
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8.若x>0,y>0,且x 4y=2,则A、4B、9 2C、5D、9
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9.13、设y=y(x)满足y" 2y y=0,且y(0)=0,y(0)=1,则y(x)dx
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10.∀x∈R,2x-1>0 B.若sinx=cosy,则x y= C.若,则 D.若x<y,则x2<y2