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... ildren are already counting, don't worry, let's look at the blackboard first..."
The math teacher has written on the blackboard in advance. The first line is 11-9=11-8=11-7=11-6=11-5=11-4=11-3=11-2=The second line is 12-9= to 12-3=, the third line is 13-9= to 13-4= in turn to 18-9=
She asked the primary school students to do the questions first. Most of the students in the class raised their heads and gestured with their fingers. Only the little girl at the front was frowning, look ...
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