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| 主要代码：
NSDecimalNumber * number1 = [NSDecimalNumber decimalNumberWithString ：@“12.5”];
NSDecimalNumber * number2 = [NSDecimalNumber decimalNumberWithString ：@“2.5”];
// 加
NSDecimalNumber * sumNum = [number1 decimalNumberByAdding ：number2];
// 减
NSDecimalNumber * subNum = [number1 decimalNumberBySubtracting ：number2];
// 乘
NSDecimalNumber * multiNum = [number1 decimalNumberByMultiplyingBy ：number2];
// 除
NSDecimalNumber * dividNum = [number1 decimalNumberByDividingBy ：number2];
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