省略乘号相当于默认加上了括号吗?比如,15÷3x=45,其中的3x省略了乘号,是不是就默认为先算乘法,将3与x看作一个整体?可教材上没有相关的论述。如果按照四则运算的顺序,应该先算除法得到5x=45。对于这个问题,我们老师之间存在争议,请专家指导。河南开封周小芳这个方程的左边15÷3x,在小学里从形式上讲可以理解为 For example, 15 ÷ 3x = 45, which omits the 3x multiplication, is not the default for the first count multiplication, the 3 and x as a whole? Can not have the textbook Related discourse. If in accordance with the order of the four operations, should be the first division to get 5x = 45. For this issue, there is a dispute between our teachers, please guide the experts. Henan Kaifeng Zhou Xiaofang left of this equation 15 ÷ 3x, formally speaking in primary school can be understood as