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Maths
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加法和减法
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Age 7-8
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level: Grade1
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Chinese
Author's Instructions
直式加减，横式加减拉线，加法应用题
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-
Maths
-
加法和减法
-
Age 7-8
-
level: Grade1
-
Chinese
Author's Instructions
直式加减，横式加减拉线，加法应用题