方程与解方程A组1.下列方程中 :x -2 =3 ;a2 + 2 a + 1=0 ;3 x -2 y =-1,3 + 2 =5 ,是一元一次方程的是 .2 .如果 x的一半为 y的 2倍与 1的差 ,列出方程为 .3 .在等式 -2 x =-2的两边都除以 -2 ,可得到等式 ,这是根据 .4.如果 -53 x =4,那么 5 x =.5 .一元一次方程的最简形式是 Equations and Solution Equations Group A 1. In the following equation: x -2 =3; a2 + 2 a + 1 = 0; 3 x -2 y = -1,3 + 2 =5, which is a unitary equation. If the half of x is the difference between 2 times y and 1 difference, the equation is listed as .3. Dividing both sides of the equation -2 x = -2 by -2 gives the equation, which is based on .4. If -53 x =4, then 5 x =.5. The simplest form of the univariate equation is