学生在学习简易方程以前,曾经采用画线段图并运用加减互逆关系、乘除互逆关系求x。教学简易方程时,只是明确提出方程及方程的解的概念,至于解方程的方法仍然是采用学生熟悉的加减运算之间及乘除运算之间的互逆关系。 Before learning the simple equations, students used to draw line segments and use the reciprocal relationship between addition and subtraction, multiplication and division, except for the reciprocal relationship. When teaching simple equations, only the concepts of equations and equation solutions are explicitly stated. As for the method of solving equations, the reciprocal relation between addition and subtraction operations and multiplication and division operations familiar to students is still adopted.