The method of mixed operation of rational numbers

1. First, multiply and divide, then add and subtract;
2. The same level operations are performed from left to right in order;
3. If there are brackets, the first small, then middle, and last large, then calculate in turn

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3. The first problem to be solved is the answer to the problem on page 176 of mathematics volume 1 of Grade 7 in Beijing Normal University
4. There must be a problem with the plan, and there must be others
5. How to solve the second problem on page 190 of the seventh grade mathematics volume I of Beijing Normal University Edition
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8. The latest edition of 2012 textbook, seventh grade volume I mathematics evaluation manual, Chapter II rational number section and thinking, p38 [content and method], the first question of knowledge and structure box filling, the first session P40 [inquiry and thinking] the sixth question of operation calculation and research, the second session p42 inquiry and thinking, the sixth question of binary
9. The given line AB 2cm extends AB to C, making AB to C, making BC = 2 / 1 × AB, and then extends AC to D in reverse, making ad = 2 / 1 × AC 【1】 Draw this picture 【2】 Finding the length of line segment ad
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11. Several mixed operations of rational numbers 1-0.2×【-3-4×（18/5-5.3）】（1/20-3/4）×【5/7+（-5/14）】 -22/7×（22/7-4/3）×7/22÷（-22/21） {4-【12+4×（3-10）】}÷5 The above four problems can be easily calculated by the formula
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