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1. 2N, 5N, 8N ____ ____ _____

2. x+y,2x+y,3x+y _____ _____ _____

3.40b,35b,30b _____ _____ _____

4.2 , 6 , 10 _____ _____ _____

5.E5, F6,G7 _____ ______ ______