乘号“×”与“.”是数学中的两种求积运算符号,它们表示相同的数学的意义,但在具体使用时容易陷入以下两个误区:1、将乘号“.”误认为是小数点。如:5乘以7,如果用“·”就表达成了:5·7,完全有可能误认为表示五点七,所以,只能用“×”表示为:5×7.即:当具体的数与数相乘时,用 The multiplication sign “x” and “.” are two kinds of quadrature operation symbols in mathematics, they represent the same mathematical meaning, but in the specific use, it is easy to fall into two misunderstandings: 1. Mute the sign “.” Is a decimal point. Such as: 5 multiplied by 7, if the use of “·” to be expressed as: 5. 7, it is entirely possible to mistakenly think that the expression of 5.7, it can only be used “x” is expressed as: 5 × 7. That is: When When the number is multiplied by a number, use