关于连减的简便计算的几种题型：连减的简便计算主要有两种题型：

一是先算出后两个数的和，再用被减数去减，如：612-245-55，可以写成：

612-245-55
=612-（245+55）
=612-300
=312

延伸的题目还有如：978-25-25-50，可以把后面三个减数先加起来，再减它们的和。

978-25-25-50
=978-（25+25+50）
=978-100
=878

第二种题型：先减去第三个数，再减第二个数，如：674-135-74，可以这样算

674-135-74
=674-74-135
=600-135
=465

延伸的题目有如：934-63-137-234，可以同时用到上面的两种简便方法。你会做吗？

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