特殊用法binary subtraction1.二进制减法chemical subtraction1.化学去污direct subtraction1.直接减法frequency subtraction1.频率扣除[减法]optical subtraction1.光学相减proper subtraction1.真减subtraction of series1.级数的减法subtraction of terms of the same sign1.同号项相减subtraction of vectors1.向量减法subtraction with serial operation1.串行减法