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本文提出并分析了模为合数时多值逻辑中模加与模乘运算的逆运算──模减与模除运算．它的引入使模减、模除运算的基数（模）的取值域从素数扩展到合数，从而完善了对模代数中的模减、模除运算的研究．
In this paper, we propose and analyze the inverse operation of modulo addition and modular multiplication in the case of modulus-wise multi-valued logic-modular subtraction and modular division. Its introduction reduces the modulo and modulo the modulo value range from prime number to composite number, so as to perfect the research on modulo and modulo operation in modulo algebra.