通过已知数可以算出未知数。
如果要想求出未知数，你首先得知道已知数。
If you want to get the unknown number, you should know the known number first.
说明：输入一个数，在已知数组中查找该数的位置，输入的数不存在数组中。
Enter a number in the array to find the number of known positions, the number entered does not exist in the array.
巧用图表法，碰到有些数学难题，可将已知数和未知数之间的关系列成图表，找出解题的方法。
V. Using the chart method, some mathematical problems encountered can be given numbers and the unknown relationship between the lash chart, find the problem-solving approach.
地层的一些分应力可以直接测量，而且其它的可以从已知数推导，但是一些必须根据相互关系而估计。
Some stress components in a formation can be measured directly, and others can be derived from known quantities, but some must be estimated based on correlations.
用于物质的定性定量分析。可用于已知数、未知数的分子量、结构等测定，广泛适用于工业、农业、医药卫生、环境保护、科学研究等各个领域。
Qualitative and quantitative analysis; Identification of unknown and known samples; Widely used in industry, agriculture, medical work, environmental protection and scientific researches.
用于物质的定性定量分析。可用于已知数、未知数的分子量、结构等测定，广泛适用于工业、农业、医药卫生、环境保护、科学研究等各个领域。
Qualitative and quantitative analysis; Identification of unknown and known samples; Widely used in industry, agriculture, medical work, environmental protection and scientific researches.
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