How to establish the multiplication formula of ancient poetry in one line, two lines and three miles?

2*3=6,4*5=20,6*7=42。

Poems of Mountain Villages by Shao Yong in Song Dynasty

At first glance, it is two or three miles away, and mist hangs over four or five families.

The pavilions are six or seven, and the flowers bloom in eighty or ninety.

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Unconsciously, two or three miles away from home, a faint fog shrouded four or five families. There are six or seven pavilions on the roadside with eighty or ninety flowers.

This ancient poem, which cleverly embeds the numbers from one to ten, also presents us with the beautiful scenery of the suburbs: not far away, there is a small mountain village where several families live with smoke curling up. Several pavilions are arranged in a patchwork manner, and all kinds of beautiful flowers are blooming on trees and roadside.

Creation background

Once you go 23 miles, it is also called a mountain village. When the poet visited the city of * * * (now Huixian County, Henan Province) in the spring of March, he saw the spring scenery and charming pastoral scenery in the countryside. He wrote this poem in order to express the poet's leisurely mood and positive attitude towards life.