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Bài 1: 1. Cho N = 1- 8 + 15 - 22 + 29 - 36 + ..... a, Biết N = 141. Hỏi N có bao nhiêu số hạng. b, Biết N có n số hạng. Tính giá trị của N theo n. 2. Tính : ( 1+ 2 $\frac{1}{3}$ - 3 $\frac{1}{4}$ ) ; : ( 1 + 3 $\frac{7}{12}$ - 4 $\frac{1}{2}$ )
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