设 int x = 1, y = 3 , 能正确表示代数式 3x|x-y| 的 C++ 表达式是 ( ) 。 ( 注: abs( ) 是取绝对值的系统函数 )
A.
abs(x-y)*3*x
B.
3x(abs(x-y))
C.
3x||(x-y)
D.
3*x*(x-y)|| 3*x*(y-x)
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举一反三
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