Thinking of solving problems: In practical problems, division is generally used when the keyword is average, multiplication is generally used when multiple is used, addition and subtraction are generally used when the number is more or less, and formulas are applied according to keywords.

Problem solving process:

(33.5-4.8)-4.8

=28.7-4.8

=23.9

A: Xiaoming was originally 23.9 yuan.

Vertical calculation of extended data-calculation result: align the units of the minuend and the minuend, and then subtract them from the numbers in the corresponding counting units respectively. If the drop is not enough, you need to borrow 1 from the high position, and then calculate the results in turn. If the subtrahend is less than the minuend, add a negative sign to the final result of two numbers. Fractional subtraction can refer to the integer subtraction step;

Problem solving process:

Step 1: 1.7-0.8=0.9 Borrow 1 from the company and subtract the decimal part.

Step 2: 8-4- 1=3

Step 3: 2-0=2

According to the above calculation steps, the comprehensive calculation result is 23.9.

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