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20 1 1 Problem No.7 of the second model mathematics in grade three, how to analyze this problem? My spatial imagination is very weak.
You can do this problem by elimination. Because there is one of the four, you just need to find out the three used, or draw a picture yourself.
If your spatial imagination is weak, you might as well do more of these questions, which may help to improve your spatial imagination. The answer to the question can be found in the questions of various places and years.