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逆转巴维能力,:是一种作常重要的思维能力。它能超脱习惯性思维束缚,结合正向思维,纵横自如地解次各种实际问题。在小学数学教学中,当涉及较多的公式、关系式的时候,我们可根据加与减、乘与除等互逆关系,精心设计一些练习题,来培养学生的逆铸思维能力。例如,教完“求平均数问题”以后,可设计三个;J题让学生练习: (l)学校期中考试时,小强的政治得8'分,语文得92分,数学得98分。小强这三门功课的平均成绩是多少分? (2)小强在期中考试中,政治、语文、数学这三门功课平均分数为92分。问:这三门功课的总分是_一咨少? (3)在期中考试中,小强的政治、语文平均成绩为89分,数学成绩是蛇分。问,这三门功课的平均成绩是多少
To reverse Babylonia: is a very important thinking ability. It can transcend the shackles of habitual thinking, combined with positive thinking, free and easy solution to various practical problems. In elementary mathematics teaching, when more formulas and relations are involved, we can elaborate some exercises according to reciprocal relations such as addition, subtraction, multiplication and division, and so on, so as to cultivate students' ability of reverse casting thinking. For example, after finishing teaching “Average Problems”, three can be designed; Question J allows students to practice: (1) In the middle school exams, Xiao Qiang's politics attained 8 'points, the language had 92 points, and the maths score 98 points . Xiaoqiang these three door average grade is how many points? (2) Xiaoqiang midterm exam, politics, language, mathematics, the three homework average score of 92 points. Q: The total score of these three subjects is ________ (3) In the midterm exams, Xiao Qiang's political and linguistic average score is 89, and his math score is Snake. Q. What is the average grade of these three subjects?