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Math problem in the first grade of primary school: look at the formula
Slant discharge! Then think of it this way. This is a subtraction formula.

Draw two rows of circles *** 16, the first row and the second row (first? ) All four are diagonal lines, and the last four are basket lines.

16-9-3=4

The circle has two rows of *** 16, the first four in the first row and the second row are diagonal lines, and the last four are basket lines.

16-8-4=4