在练习中培养学生思维能力的“三设计”○陈玉莲（南昌县广福乡南溪小学）设计之一：多层次练习根据数学知识的内在联系，按照由浅入深，由简到繁，由易到难设计多层次练习，以使学生的思维不断深化。如学生在运用乘法分配律进行小数、分数四则混合运算时，设计如下三个层... In the practice of training students thinking ability of the “three design” ○ Chen Yulian (Nanchang Guangfu Township Nanxi Primary School) Design one: multi-level practice According to the internal relations of mathematical knowledge, according to the shallow into the deep, from simple to complex, easy Difficult to design multi-level practice, so that students continue to deepen their thinking. Such as students in the use of multiplication distribution law decimal, fractional four mixed operation, the design of the following three layers ...