同学们在学习了有理数以后,接触到去括号的知识时,不是符号搞错,就是忘记乘以括号前面的系数,尽管自责过许多次千万要小心,但效果仍然不佳。初学者要想在短时间内掌握该知识点有一定的难度(就是八、九年级的同学也难以把握),笔者从多年的数学教学中总结出一个短句“去括号,看符 After learning the rational numbers, when the students came into contact with the parenthesis, either the symbols were wrong or they forgot to multiply the coefficients in front of the parentheses. Even though they had to be careful when they were responsible for many times, the results were still poor. For beginners to master the knowledge in a short period of time with certain difficulty (that is, students in grades eight and nine are difficult to grasp), the author summarizes a short sentence from the mathematics teaching for many years