1、计算器mrc是指取回保存值然后进行综合运算。2、在计算器上输入某一个数字之后，点击M+或M-，就表示把这个数字保存起来，可以再输入其它的数字，当需要前面的数字时，按一下开发者_如何转开发MRC即可[详细]
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