乘法 System.out.println(new BigDecimal("9.977777991111111111111").multiply(new BigDecimal("9.977777799"),MathContext.DECIMAL128)); 除法 System.out.println(new BigDecimal("96.11111111").divide(new BigDecimal("9.977777799"), 4, RoundingMode.HALF_DOWN));
输出结果: 99.556051723059263786665558024689 9.6325