79×79/80简便计算？
解:原式=（80-1）×79/80
=80×79/80-1×79/80
=79-79/80
=78又1/80
79✘79/80
=（80-1）x79/80
=80x79/80-1x79/80
=79-79/80
=78又1/80
希望能帮到你！
79×79/80
=(80-1)×79/80
=80×79/80-1×79/80
=79-79/80
=78又1/80
79×80/79=80 回答完毕~~有疑问请追问，无疑问请点击【采纳】~祝学习进步~~~(^o^)/~
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