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变量 dx, dy, dz的声明和初始化如下: double dx = (double) x; double dy = (double) y; double dz = (double) z; 若float和double分别采用了IEEE754单精度和双精度浮点数格式,sizeof(int) = 4, 则对任意int型变量 x, y, z判断下述表达式是否。 1、 dx * dx >= 0 2、(double)(float) x == dx 3、dx + dy == (double) x + y 4、(dx + dy) + dz == dx + (dy + dz) 5、dx * dy * dz == dz * dy * dz 6、dx /dx == dy / dy