Teaching Aims: 1.Get the students to grasp the sequence of the arithmetic. Be able to use the brace, and work out the problems about the arithmetic.

• 教学目的:使学生进一步掌握整数.；小数四则混合运算的运算顺序；会使用中括号；能够正确地计算整数；小数四则混合运算式题