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View Compilation Error

0_0_11352527_17975\Main.java:22: 运算符 + 不能应用于 java.math.BigInteger,java.math.BigInteger
		ans=F(k).multiply(BigInteger.valueOf(4))+k.multiply(BigInteger.valueOf(6));
		                                        ^
0_0_11352527_17975\Main.java:24: 找不到符号
符号: 方法 subtract(int)
位置: 类 java.math.BigInteger
		ans=F(k).multiply(BigInteger.valueOf(2))+F(k.subtract(1)).multiply(BigInteger.valueOf(2))+k.multiply(BigInteger.valueOf(4))-BigInteger.valueOf(4);
		                                            ^
0_0_11352527_17975\Main.java:24: 运算符 + 不能应用于 java.math.BigInteger,<any>.multiply
		ans=F(k).multiply(BigInteger.valueOf(2))+F(k.subtract(1)).multiply(BigInteger.valueOf(2))+k.multiply(BigInteger.valueOf(4))-BigInteger.valueOf(4);
		                 ^
0_0_11352527_17975\Main.java:24: 运算符 + 不能应用于 <nulltype>,java.math.BigInteger
		ans=F(k).multiply(BigInteger.valueOf(2))+F(k.subtract(1)).multiply(BigInteger.valueOf(2))+k.multiply(BigInteger.valueOf(4))-BigInteger.valueOf(4);
		                                        ^
0_0_11352527_17975\Main.java:24: 运算符 - 不能应用于 <nulltype>,java.math.BigInteger
		ans=F(k).multiply(BigInteger.valueOf(2))+F(k.subtract(1)).multiply(BigInteger.valueOf(2))+k.multiply(BigInteger.valueOf(4))-BigInteger.valueOf(4);
		                                                                                                                           ^
5 错误


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