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:

89+28×4+67

=89+ 1 12+67

=20 1+67

=268

Extended data->; Calculation process: align the two addend numbers, and then add the numbers in the same counting unit separately. If the addition result exceeds 10, it goes to the high position 1; if the high position is added, it needs to accumulate 1 to the low position.

Problem solving process:

Step 1: 1+7=8

Step 2: 0+6=6

Step 3: 2+0=2

According to the above calculation steps, the comprehensive calculation result is 268.

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