学生在用方程解决实际问题时总苦于不会找等量关系或者不知道如何沟通未知量与等量关系,从而达到求解的目的。如果让他们意识到“部分等量关系用来列方程,剩余等量关系用于表示未知量”的事实,那么他们在解决此类问题时就不会无从下手,反而会出现一题多解或者“巧设元、少计算”的思路。 Students in the use of equations to solve practical problems always suffer from not looking for the same relationship or do not know how to communicate the unknown and the equivalent relationship, so as to achieve the purpose of solving. If they are made aware of the fact that “partial equivalence relations are used to rank equations and the remaining equivalence relations are used to denote unknowns,” they will not be able to tackle such problems without overwhelming one problem Solution or “clever design yuan, less calculation ” train of thought.