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混合运算包括含有不同级运算的两三步计算式题和带有小括号的两三步计算式题,是加、减、乘、除计算的复习、巩固和综合运用,又是进一步学习四则混合运算的基础。熟练地掌握运算顺序,并能正确地进行脱式计算,对提高学生计算能力是非常重要的。但在实际教学中,许多学生做混合运算式是的正确率并不高,出现运算顺序的错位。究其原因,很大程度在于学生解题时随意性较强,没有认真审题。我开始教学计算这类题目时,强调必须先用横线划出先算的部分,再计算。如:
Mixed operations include two or three steps with different levels of computing equations and two or three steps with parentheses calculation formula is addition, subtraction, multiplication, addition to the calculation of review, consolidate and comprehensive use, but also to further study the four mixed The basis of computing. Proficiency in the sequence of operations, and can be properly calculated off-point, to improve the computing power of students is very important. However, in practical teaching, many students do not have a high correct rate of mixed arithmetic expressions, and the order of operations is misplaced. The reason, to a large extent, is that students are more random when solving problems, without serious examination. When I started teaching the calculation of such topics, I emphasized that we had to draw the first line of the line and then calculate it. Such as: