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:
738+2 17+2 1
=955+2 1
=976
Vertical calculation of extended data-calculation result: align the digits of two addends, and then add the numbers in the same counting unit respectively. When the addition result exceeds 10, 1 is added to a higher order, and the high-order addition needs to accumulate the result of 1 to a lower order.
Problem solving process:
Step 1: 5+ 1=6
Step 2: 5+2=7
Step 3: 9+0=9
According to the above calculation steps, the comprehensive calculation result is 976.
If in doubt, please ask questions. If satisfied, please adopt them.