在近年关于二元一次方程组的中考题中,出现了一些构思巧妙、新颖独特的创新题型,这类题型对培养同学们思维的灵活性、开阔视野大有益处.下面让我们一同来体会这类创新试题带来的新感受.一、开放组合型例1已知二元一次方程①x+y=4;②2x-y=2;③x-2y=1.请从这三个方程中选择你喜欢的两个方程,组成一个方程组,并求出这个方程组的解. In recent years on the Binary School Equations in the senior high school entrance examination questions, there are some creative ideas, novel and unique innovative questions, such questions to cultivate the students thinking flexibility, broaden their horizons great benefit. Let us come together Understand the new experience brought by such innovative questions. First, the open combination Example 1 known bivariate equation ① x + y = 4; ② 2x-y = 2; ③ x-2y = 1. Please choose from these three equations The two equations you like, make up an equation group, and find the solution to this equation.