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下面两道求值题,可以利用比例的性质求解,而且比其他解法简便得多。 1.通过比值求解例1 已知a/2~1/2=b/3~1/2=c/5~1/2,求ab+bc+ca/a~2+b~2+c~2的值。
The following two evaluation questions can be solved by using the properties of the scale and are much simpler than other solutions. 1. Through the ratio solution Example 1 Known a/2~1/2=b/3~1/2=c/5~1/2, find ab+bc+ca/a~2+b~2+c~ The value of 2.