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研究一些好的竞赛题目,不仅可以培养同学们的学习兴趣,还可以提高同学们的逻辑思维能力,下面就跟着陈老师和杨老师去看一看吧.例1若关于x,y的二元一次方程组{x+2y=m+3,x+y=2m的解中x,y的值恰好是一个等腰三角形的腰长和底边长,且这个等腰三角形的周长为7,求m的值.解析:我们可以把m看作已知数解出x与y,然后分x为腰长和x为底边长两种情况讨论.
Study some good competition topics, not only can cultivate students ’interest in learning, but also can improve the students’ logical thinking ability, following Chen and Yang to see it.Example 1 If the binary about x, y The value of x, y in the solution of an equation system {x + 2y = m + 3, x + y = 2m happens to be the length of the lumbar and base of an isosceles triangle with a circumference of 7, Find the value of M. Analysis: We can think of m as a known number to solve for x and y, and then divided into x for the waist length and x for the bottom two cases discussed.