解二元一次方程组的基本方法是代入消元法和加减消元法.应用加减消元法解题时,往往是通过两式相加或相减,达到消元的目的.实际解题时,若能灵活运用“加减不消元”的方法,则可使一些二元一次方程组既简捷又巧妙地获解.一、加减不消元,消去常数项例1解方程组53xx++68yy==72.,①!? The basic method for solving binary equations is to substitute the elimination method and addition and subtraction elimination method. When the problem is solved by adding or subtracting elimination method, it is often achieved through the addition or subtraction of two equations to achieve the purpose of elimination. In the question, if we can flexibly use the “add, subtract, and eliminate yuan” method, we can make some binary first-order equations be solved simply and skillfully. I. Addition, subtraction, elimination, elimination of constant items Example 1 Solution equations 53xx+ +68yy==72.,1!?