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987654321×12345-987654322×12344的简便运算是什么
QAQ
人气:266 ℃ 时间:2020-04-09 03:12:18
解答
987654321×12345-987654322×12344
=987654321×12345-987654321×12344-12344
=987654321×(12345-12344)-12344
=987654321-12344
=987641977
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