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java lang StrictMath scalb(floatf,intscaleFactor)方法返回d×2scaleFactor舍入好像由一个单一的执行正确舍入的浮点乘法的浮点值集
java lang StrictMath scalb(doubled,intscaleFactor)方法返回d×2scaleFactor舍入好像由一个单一的执行正确舍入浮点乘法的double值集