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一题多解,对于开阔思路,培养创新能力大有裨益,请看下面一例: 题目:已知a+2b+3c=20 ,a+3b+5c=31,则a+b+c=_________.(1998年陕西省中考题)
There are many solutions to this problem, which are helpful for broadening ideas and cultivating innovative capabilities. Please see the following example: Topic: Knowing that a+2b+3c=20 and a+3b+5c=31, then a+b+c=_________. (1998 Shaanxi Provincial Examination Questions)