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Mixed operation of addition, subtraction, multiplication and division within grade 3 100
The mixed operation of addition, subtraction, multiplication and division within grade 3 100 87+ 12-33

Thinking of solving problems: Four arithmetic rules (calculation in sequence, first multiplication and division, then addition and subtraction, first parenthesis, first power), that is, disjoint operation (recursive equation calculation), should be carried out on the premise of this principle.

Problem solving process:

87+ 12-33

=99-33

=66

If in doubt, please ask questions. If satisfied, please adopt them.