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View Compilation Error

759084_0_0_19047\Main.java:5: 找不到符号
符号: 类 Scanner
位置: 类 AB
    Scanner sc = new Scanner(System.in);
    ^
759084_0_0_19047\Main.java:5: 找不到符号
符号: 类 Scanner
位置: 类 AB
    Scanner sc = new Scanner(System.in);
                     ^
759084_0_0_19047\Main.java:21: 找不到符号
符号: 类 BigDecimal
位置: 类 AB
    BigDecimal b1 = new BigDecimal(a).stripTrailingZeros();
    ^
759084_0_0_19047\Main.java:21: 找不到符号
符号: 类 BigDecimal
位置: 类 AB
    BigDecimal b1 = new BigDecimal(a).stripTrailingZeros();
                        ^
759084_0_0_19047\Main.java:22: 找不到符号
符号: 类 BigDecimal
位置: 类 AB
    BigDecimal b2 = new BigDecimal(b).stripTrailingZeros();
    ^
759084_0_0_19047\Main.java:22: 找不到符号
符号: 类 BigDecimal
位置: 类 AB
    BigDecimal b2 = new BigDecimal(b).stripTrailingZeros();
                        ^
6 错误


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