Java中BigDecimal除法使用不当导致精度问题

@Test
public void testBigDecimal() {
    BigDecimal origin = new BigDecimal(541253);
    BigDecimal now = new BigDecimal(12389431);

    BigDecimal val = origin.divide(now, RoundingMode.HALF_UP);
    System.out.println(val);

    origin = new BigDecimal(541253);
    now = new BigDecimal(12389431.3);
    val = origin.divide(now, RoundingMode.HALF_UP);
    System.out.println(val);

    origin = new BigDecimal(541253.4);
    now = new BigDecimal(12389431);
    val = origin.divide(now, RoundingMode.HALF_UP);
    System.out.println(val);
}

BigDecimal origin = new BigDecimal(541253);
BigDecimal now = new BigDecimal(12389431);

BigDecimal val = origin.divide(now, 5, RoundingMode.HALF_UP);
System.out.println(val);

BigDecimal origin = new BigDecimal(541253);

// java.math.BigDecimal#BigDecimal(int)
public BigDecimal(int val) {
    this.intCompact = val;
    this.scale = 0;
    this.intVal = null;
}

public BigDecimal(long val) {
    this.intCompact = val;
    this.intVal = (val == INFLATED) ? INFLATED_BIGINT : null;
    this.scale = 0;
}

@Test
public void testBigDecimal() {
    BigDecimal origin = new BigDecimal(541253.0);
    BigDecimal now = new BigDecimal(12389431.1);
    BigDecimal tmp = new BigDecimal(0.0);
}

@Test
public void testBigDecimal() {
    BigDecimal origin = new BigDecimal("541253.0");
    BigDecimal now = new BigDecimal("12389431.1");
    BigDecimal t = new BigDecimal("0.0");
}