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1.在Z模x则x
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2.设 |x z|<|y|(x,y,z∈R),则A、|x|>|z|-|y|B、|x|>|y|-|z|C、|x|<|z|-|y|D、|x|<|y|-|z|
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3.已知x(n)的z变换是X(Z),则x(n-1)的z变换是()
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4.设 z = f(u, v),u = φ(x, y),v = ψ(x, y),则∂z/∂x = ( )
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5.为表示关系'a'≤x≤'z' ,C 语言表达式应是( )A、(x<='z')&&(x>='a')B、(x<='z')&(x>='a')C、(x<='z') and (x>='a')D、(x<='z
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6.x /= x*y z等价的语句是 。A、x=x/(x*y z)B、x=x/x*y zC、x=(x*y z/)xD、x=x*y z/x
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7.在l0℃A、X >Y>ZB、Z>Y>XC、X>Z>YD、Y>X>Z
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8.x=3,y=4,z=5,执行以下语句if(x>z)[x=y;y=z;z=x;] else [x=z;z=y;y=x;] x=__y= __z= __。
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9.Using DeMorgan’s Law, write an expression for the complement of F if F(x,y,z) = xy xz yz.
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10.X :( K x)Z :=k-x z'k'x Ju